The teaching of elementary economic behaviour to the slow learner.


In a previous publication, (Locking, 1966), a programme for the teaching of the skills involved in the appreciation of 'numerosity' was described. The final goal of this programme was said to be achieved when the pupil could accurately and reliably judge the number of discrete items in a collection e.g. he could tell the teacher that there were 10 dolls or 18 pencils etc. In the last paragraph of that article it was stated that a programme for the teaching of the more complex behaviour required in such achievements as the understanding of why prices differ was in the process of development. Such a programme is a natural extension of the one first described. The present paper, written a few years after the first, describes this further development.
First let us broadly subdivide economic activities into two major kinds, buying activities and selling activities.
For the low level functioning individual (sub-normal, E.S.N. pupil, chronic schizophrenic etc ), activities of the former sort will be most importantly the buying of commodities, (but perhaps also services e.g. hair cutting), while those of the latter kind will be mostly the selling of labour. Let us attend firstly to the former i.e. buying.
It will be simplest if we indicate, at first broadly, what the goals of the teacher should be when she attempts to convey to the pupil the reasons for variations in the price of commodities and how this depends upon such factors as number of articles, weight, type of article and so on. She must:-
A1. Develop or ensure that the pupil's judgement of numerosity is at a fairly high, as high as possible, level of sophistication.
A2. Develop, along similar lines, the pupil's judgement of other attributes which are relevant to the determination of price.
A3. Develop again, along similar lines, the pupil's judgement of the attribute of economic worth or price
B. Develop the appropriate connections or correlations between these attributes, especially the appropriate dependence of the price of a set of articles upon their number, their weight etc.
Now topic A1 has been dealt with in the previous article. A2 and A3 may be similarly developed e.g. for the attribute of weight the teacher must first ensure that the pupil can determine the equality of two collections or objects with respect to weight and that he asserts that they are equal in weight if they balance the arms or pans of a pair of scales, (Nominal Stage), then show how one collection is judged to be greater in weight than another (Ordinal), and so on.
What of phase B?
This can be approached in the following way. Choosing two of the attributes mentioned above, say those of numerosity and economic value or price we can proceed so:-
B1. The Nominal - Nominal Level of Association
In this step the pupil must be got to appreciate that if on one occasion three apples cost 6p then, all other factors remaining the same, that group of items will always cost 6p. Since we don't want to get involved in the question of seasonal fluctuations we will assume that we are talking about a given time, and locality, where there is uniformity in different shops. As for this latter point the pupil perhaps should have some expectations, he can judge if the shopkeeper is charging too much. The statistical model here is the form of association known as the contingency coefficient. As usual, with all other factors held constant, the coefficient should be perfect and positive. In this case the table might be such as the following:-
Whereas if the other factors were only partly controlled then it might be thus:-
In this case usually 2 apples cost 4p but sometimes they cost 2 pence, sometime 6p or 8p. In the first case they might be small cooking apples , in the second and third cases they might be large and/or choice quality dessert apples. To use the language of experimental psychology the number of articles is a cue for the categorisation of price, (but a probabilistic one only)
B2 The Ordinal - Ordinal Level of Association
This represents the next level of sophistication or complexity of the association between the attributes of price and numerosity. One can think of this as a rank order correlation between the two attributes or variables. It turns out to be perfect and positive if all other relevant variables are held constant in value, e.g. type of article, weight etc. Concretely the pupil must say that e.g. three oranges will cost more than one orange. In general the principle here is that the larger the number the greater the price. As a generalisation the aim might be to get the pupil to verbalise it. This would be more ambitious than the former limited goal. Moreover it might be verbalised by the teacher and employed in teaching and effecting the desired behaviour. But it might very well not be effective however and the teacher must be on the lookout for such failure.
The pupil's verbal system may be at fault here. Really it would suffice if the pupil manifested the correlation in his concept or sorting behaviours, i.e. if he acted as though he had verbalised the principle. This could be done by backing up this statement with numerous examples, (compare similar discussion on the question of verbalisation in stage 1 of the attribute of numerosity as described in the previous article.) Let us call the attribute of price Y, (the dependent variable) and the attribute of numerosity X, (the independent variable) . When we keep all other relevant variables constant we must have, that the pupil should always, no matter which x1,y1 and x2,y2 are selected say that iff x2 >x1 then y2 > y1. The knowledge then that the relation > holds between x2 and x1 will enable the pupil to predict that the relation > will hold between y2 and y1. The fact that x2 > x1 will be a cue for him to categorise the ordered pair as a member of the class indicated by the symbol ' > '.
B3. The Interval - Interval Level of Association
Now the pupil must say that for all x1,y1 and x2,y2 iff x2 = x1 + n then y2 = m ( x1 + n ) + c. The difference or increase in Y is y2 - y1 i.e. (m ( x1 + n) + c) - (mx1 + c), i.e. m ( x1 + n) + c - mx1 -c, i.e. mn. So if we increase X by n then Y is increased by mn. In the case of price this means that if we have n more articles then the price will increase by n times m. 'm' would represent the gradient of the line expressing the relationship between the price and the number of articles, i.e. the price of a single article.
B4 The Ratio - Ratio Level of Association
Since we wish ultimately to achieve in the pupils behaviour an actualisation of a simple direct proportion between price and number of articles (if type of article etc is held constant) then we proceed thus:-
For all x1,y1 and x2,y2 iff x2 = 2x1 then y2 = mx2 + c,
i.e. y2 = m(2x1) + c.
So the ratio of y2 to y1 i.e. y2/y1 is m ( 2x1) + c/mx1 + c. So the ratio of y2 and y1 will be 2, i.e. y2 = 2y1 iff c = zero, i.e. if the line expressing the relationship between passes through the origin.
In the case of price this means that one must assume that zero articles cost zero pence. Then at the end of this stage we will have achieved in the pupil's behaviour actualisation of direct simple proportion between price and number of articles, (with all other relevant factors held constant), i.e. price number of articles or price = m ( number of articles) where m = price of a single article. We have achieved price = m.Number + c. where c = 0.
Graphically,
So the verbal generalisation might be: "Double the number and you double the price." This includes such statements as "four oranges cost twice as much as two oranges". (Since four = 2 x 2 so cost of 4 = cost of two x 2) Then if pupil knows that the cost of 2 oranges is five pence he can deduce that the cost of four oranges will be 10 pence.
Notes.
1. A generalisation which is also appropriate and which includes the former and is therefore even more general and abstract is "Multiply the number by any number (i.e. multiply by k) and the price will be multiplied by that same number, (i.e. by k)
2. It will be noted that we have taken the simplest possible law for the relationship of price and number of articles which could have any claim to be a reasonably close approximation to economic reality. Of course with large quantities a sort of wholesale factor might enter into the problem. However in the case of the low functioning individual it would seem that any kind of grasp of the situation is better than none at all, even if it's only approximate. Subsequently, if desired, refinement to the pupil's ideas can be attempted. In any case these refinements are in fact only embellishments on the basic law we have just described.
After the teacher has developed the connection between price and the attribute of number of articles, she should then attend to the other possible connections e.g. price and weight, price and length, as in the buying of cloth etc. In all these cases the aim of the teacher is to make those attributes which are defining, criterial. ( Bruner et al "A study of thinking"). The pupil then solves such questions as:- "If one orange costs 3p, how much will three oranges cost?" He sees that the only change is of number, and computes accordingly in one or two steps at most. In the above problem it is of course one step, in the problem two items cost 4p, how much will six items cost?, the number of steps is of course two.
Next the pupil should be ready to tackle more complex problems where the end state and beginning differ in 2, then 3 attribute values, e.g. 2 x 4 oz tins of beans cost 40 pence, How much will 3 x 8 oz tins cost?
3. The final aim of this (buying), section is of course to make the pupil act with understanding with reference to the fact that price depends on many things, i.e. is multiply determined and that in order to know the price of a thing one must know things like the number of items, their type, weight etc.
Throughout the section from B1 to B4, for any of these attributes it will be noted that it is initially the teacher who makes sure that it is only in respect of one attribute that the two parts of a problem differ; then the pupil, because he knows that e.g. price is proportional to weight, will make the appropriate deduction. However, when he is confronted with a problem in which two or more attributes differ in their values then he must himself ensure that, in the first step he keeps all attributes constant in their value save one, (one independent variable that is ). This is of course because of the rule that price is proportional to weight, (less specifically there is a perfect correlation between these two) only when all other variables are held constant. For example in the problem in two parts mentioned above we start with the fact that 2 x 4 oz tins of beans cost 50 pence. We cannot say that 3 x 7 oz tins of beans will cost one and a half times as much, i.e. 75 pence, because we have not held all other relevant variables constant. i.e. here the factor of size or weight of tin. So of course we need an intermediate step where we say that "therefore 3 x 4 oz tins of beans will cost one-and-a-half times as much, i.e. 75 pence. This is similar to the case in the previous article, (see note concerning situation C. page 35.)
To conclude this section on the topic of buying behaviour let us consider a further very important connection or relationship between the attributes or constructs already mentioned and the construct 'Good'-------'Bad'. To take an example consider the connection between the attribute 'numerosity' (of goods or commodities) and the bipolar construct or attribute 'Good'-------'Bad'.
The pupil should certainly behave as though he understood that to receive commodities is good, but to give them is bad . This would correspond to a Nominal--Nominal association between the attributes or constructs mentioned. If we consider the relationship at a more advanced level we should have some such statement as "To be given four pears is good, but to receive seven pears is better." This would correspond to an Ordinal--Ordinal level of association between the two attributes.
Then we might have a situation corresponding to the Interval-- Interval type of association and finally that corresponding to the Ratio--Ratio type e.g. "To get 4 apples is good, to get 8 apples is twice as good".
Similar considerations of course apply to the connection between 'giving away money' and 'Bad', and so on.
Also on the same kind of lines are the associations, on the selling side, between the constructs such as 'spending time at work' and 'Bad', between 'being given money (for working)' and 'Good' and so on. For example as an economic simplification, (one actually used in that science), time spent in working is bad. This is a useful first approximation rather in the way in which the simple direct proportion between price and number of articles is a good first approximation. Obviously this does not do justice to the people who like their work but here we can invoke such factors as non-financial or intrinsic compensation etc). As a further step then here we can say that "5 hours spent at work is bad, 9 hours spent in work is worse."
Finally let us consider the practice of regarding payment for work done as a sort of compensation. In the ideal and simple case where the person's only compensation is a financial one then there will often be a balance of two factors, the inconvenience involved in working and the convenience of receiving money, (here wages). In a similar manner the act of giving money to a shopkeeper, (a 'bad' thing as far as the shopper is concerned), is compensated for by his receipt of goods. (In this situation the giving of money is of course referred to as 'paying').
As a further illustration of this consider the following quotation from Bleuler which antedates the present exposition by 55 years!
"Of course, no clear and accurate thinking operations can be carried out with fragmentary concepts. A rather lazy patient had finally been induced to do some work for a half-hour. He then believed that he had a right to obtain all sorts of rewards. When these were not forthcoming he again stopped working. He was still correct in his thinking that he should be compensated for his work but he did not distinguish between half an hour of work and persistent work; and just as little did he distinguish between small and large compensation. A short bit of work was to him work in general. By the idea of compensation he understood anything which his heart desired. His concepts of accomplishment and recompense were unclear, therefore a correct quantitative correlation between the two ideas was impossible." ( E. Bleuler "Dementia Praecox" 1911)
As for the selling aspect of economic behaviour this, for the low functioning individual, will be nearly always the selling of labour. (as against that of commodities or of skill). We have already talked a little about this as far as the link with the general attribute 'Good--- Bad' is concerned. This whole topic can in fact be dealt with as the preceding one of price. While there we saw that price was multiply determined and we had to ensure that the pupil displayed an overt understanding of this, in the present case we must ensure that the pupil understands the multiple determination of wages. For example, if the person works twice as long he should expect twice as much wages, (Ratio---Ratio for the attribute of wages and hours of work)
Now we should say something about a relationship which exists between, e.g. the attribute 'Good' and the attribute 'getting money'. Now 'getting money' is in fact just one example of something which is 'good'. Other examples might be spending an evening with friends, watching a thrilling film, winning a contest, etc. Now as in factor analysis, this attribute 'good' is a general common factor, common to all the above events. In addition they all have also of course a specific or group factor representing their individual character. It is because of this common factor that such attributes as the price of a set of articles and their number is correlated, e.g. if there are twice as many articles then the price will be twice as much. Why? This is because to give away twice as much money is twice as bad therefore to balance things one requires something twice as good, which in this case is receiving twice as many commodities. But then is the factor analysis analogy appropriate or is it simply a case of a hierarchy of ordinary classes related by class inclusion?
Finally it must be mentioned that this whole method of approach to the teaching of arithmetic is not in fact limited in any way to the shaping of formal and academic skills. It would appear to be a useful approach to the shaping of any kind of behaviour and perhaps also to the unlearning of harmful and anti-social forms of behaviour. The basic reason for this is of course that it represents a convenient framework in which to view the goals and objectives of behaviour modification, starting with simple modifications and progressing to more complex types. This can be quite well illustrated in connection with the technique known as the Repertory Grid test, a technique devised by Bannister but based on the pioneering work of Osgood, and his 'Semantic Differential' . It has been suggested by Bannister that this test should enable one to decide whether a neurotic or psychopathic symptom can be removed by a simple deconditioning process or whether more complex, probably verbal, methods will also be needed. In the former case the symptom shows few or no connections (correlations) with the conceptual system of the patient. In the latter there are extensive connections of this kind. To give a simple example suppose a patient demonstrates a tendency to scratch cars. Suppose also that the manner in which he regarded 'people who scratch cars' showed either no real consistency or no significant degree of association with his other types of conceptual or sorting behaviour. Then Bannister's assertion, (which we shall provisionally adopt), is that we can then utilise rather simple methods of behaviour therapy. If, on the other hand, there are such connections, e.g. if the patient regards 'people who scratch cars' as 'good people' (maybe he regards cars as evil and in league with the devil), then the simple deconditioning approach will not, by itself, be sufficient. In that case Bannister talked rather vaguely of verbal methods or psychotherapy but I don't think that one need relinquish the field in this way to non-systematic focused and scientific procedures. One could attempt to restructure the patient's system of ideas using the Repertory Test as a guide to check progress and its content perhaps as a vehicle to produce change. In the case cited we should try to get the patient to re-categorise 'people who scratch cars' as bad people, and try the simple process again. If this does not give good results further modification may be necessary. What might happen (we would want to know the circumstances when this does occur) when we shift the correlation between the two above constructs (using learning theory principles again in view of e.g. Mowrer's breakdown of conceptual or verbal behaviour into mediating responses) is that instead of meaning that 'people----- cars' has been shifted, in denotation, for the patient, towards that of 'bad' the opposite had happened and it was the 'bad--- good' construct which had been inverted . Of course it would be possible to check this by looking at the other constructs in the grid which had formerly been e.g. 'good' and seeing if any major changes had occurred there
An attempt to clear up an ill-formulated topic.
On page 10 we ran into the difficulty that we did not know whether to regard the relationship of the construct 'Good------Bad' to others such as 'getting paid money', 'putting in time at work', 'watching a thrilling film' etc as being of the ordinary type of hierarchical class-inclusion or as are the kind seen in factor analysis, where the former attribute represents the general or at least the higher order factor accounting for the observed intercorrelations. Let us attempt to come to some initial a priori conclusions on this matter. On reflection, and remembering our diagram, which we give again below, it seems clear now that the more sophisticated model is better to adopt; in some cases the less complex case applies but in any event the simpler case is quite easily related to the more complex one, again using the diagram. Consider this now:-
We can see quite easily from this diagram how we can resolve our difficulties. There we see how both modes of conceptualisation are related to each other. If we use only a very coarse type of dichotomous categorisation of events into either good or bad by, in effect, lumping together good one, good two, etc. and also lump together 'getting paid �18', 'getting paid �10', etc and forming the dichotomous category 'getting or receiving money and 'giving away or spending money' then the Aristotelian model is quite adequate and we should say that 'giving away money' is 'bad', i.e. the class of actions referred to by the term 'giving away money' is included in the class referred to by the term 'bad things'. If we subdivided these into good one, good two, etc and into 'getting paid �18', 'getting paid �10'. etc then we could still use the model to refer to the inclusion of e.g. the class 'getting paid �18' in the class, 'good two', and to refer to the inclusion of the class 'getting paid �10' in the class 'good one', and so on. We should also mention the entry 'winning a contest'. If we regarded this as a non-quantifiable or single valued attribute then it is either there or it isn't. The related values of good may not be quantified either, then we have simply that 'winning a contest' is 'good'. Or even we might have that the event can be assigned to a particular value of 'Good', perhaps we can say how good it is to win a contest. Perhaps it is 'good 2', i.e. it is as good to win a contest as it is to get paid �18.
But now the most complex case is where both the good----bad dimension and the event or situation or type of person or whatever can be quantified. Of course at the simplest level there would simply be a dichotomy-- this would still be distinct from the Aristotelian case and we could compute a . Having more than two classes would take us more obviously away from the Aristotelian case (but notice that the higher types are always based on the lower). Then we should compute a sort of contingency table coefficient. More involved quantification would enable us to say e.g. that getting paid �18 is better than getting paid �10 and so on. Now we get to the factor analytic case very quickly indeed. In fact as soon as we have even a coarse dichotomy of good and bad, getting money and giving money (opposites) and running phi's between the dichotomies then what we get emerging is a general factor and not merely a general more inclusive class. So we can say that a general factor, structurally, is a construct or attribute itself , i.e. an organisation of classes in the Aristotelian sense, each of which is related to subordinate classes by the usual classical relation of class inclusion. This is of course non-parametric factor analysis, based on phi's and/or contingency coefficients. That the question concerns factors is even more evident as the scaling becomes more sophisticated and we go on to rank order r's, Pearson r's finally.
The distinction between 'giving away �3 pounds', and '�3' is that the former quantity is vector, the latter scalar. That is in the first case both the magnitude and the direction are specified whereas in the second case merely the magnitude is specified. Now some quantities are scalar and some are vector, e.g. velocity, mass, speed are scalar, velocity, and force are vector. In some of these cases the vector quantity is merely some scalar quantity plus consideration of the direction, in fact perhaps we can regard the matter in this way for most quantities e.g. velocity, (a vector), is speed (scalar) plus the element of direction, and therefore more complex but inclusive of it. So it is the case of the above terms or quantities. In the case of e.g. velocity, we have a very large number of possible directions, in fact an infinity of directions representing all the points of the compass and all directions intermediate to these. In the case cited above however the direction takes on simply two values, i.e. away from the subject and towards the subject. The direction (attribute), in this case is therefore dichotomous. In fact even this does not really represent the analogy or model we want. In the case of all directions proceeding from some point S we have:-
All these are possible directions and link S with all other points, if we think in terms of moving along these lines to any extent we please. If we're thinking dichotomously then we concentrate all those points which are not S into a single point (or neighbouring group of points). Call this E (environment). Then the diagram representing this state of affairs is as shown:-
S -------------------------------------E
Now according to the model previously suggested this is simply a single direction. However one has still two possibilities, one can move from S to E, or from E to S. From S to E is one direction, from E to S is a direction at an angle of 180 degrees to the first, the opposite direction. Of course E might represent some other person. If we considered, (differentiated between) cases where there were a number of other persons then there will be a number of possible directions, more than 2, or N x 2 directions, where N equals the number of persons . What we must do is look at the starting point. In one case it is S, in the other it is E. Also we can simply consider, say, a certain amount of �5 as static and therefore simply scalar thing or we can view it as taking part or being the direct object of the transaction between e.g. E and S. This may be natural (a larger breadth of view being inappropriate), or may be because we are only looking at the thing from a restricted viewpoint, there being a wider point of view possible. In this way we can look at it from the point of view of dyadic or triadic or tetradic relations etc. Let us consider this topic of complex relations further.
Re complex relations
Consider stage one of the development of the attribute of numerosity. If we consider the technique in the widest sense then what happens (cast into psychological language) is that the pupil is brought to understand that various behaviours are equivalent. When the verbal cue "Give me five things" is uttered by the teacher the pupil finds that the response of giving five red blocks is rewarded by the teacher, (verbal praise or social approval, for example) but so also is the response of giving five paper clips or five pencils etc. He finds however that giving one apple, or seven pens, or taking away from the teacher two books, is not rewarded. This is concept formation and it is the type described by Bruner as a functional category, (all members of a certain class of actions fulfil the same function of causing the teacher to administer (verbal) reward. If the class were a very concrete one, possibly even consisting of a single member, and even if there were some variation, but one where the variation produced the same category of response on the basis of the normal generalisation gradient paradigm, then we could even regard this as a form of instrumental conditioning, since the response is instrumental in obtaining the reward. Now we can also look at this logically from the point of view of the theory of relations. Thus "S gives N to E". This, as a triadic or ternary relation may not be appreciated or verbalised by the S. To do this he would have to take a wide view and consider himself as taking part in a relation with the others. (Remember that what we bring out in this discussion will likely apply also to the tetradic relation "S pays C to E for K", or S exchanges H for J with E" ( economic transactions, the latter being barter))
The concept may not be conscious as a very high level, (verbalised or even verbalisable) since the pupil may not say to himself "when I gave five apples to E it made her happy, when I gave 5 pens to E it made her happy so they are both right, i.e. equivalent. In other words the concept may be a purely motor or behavioural one and not be verbal. The role of S in this will most probably not be important. Even if verbalised the situation would (essentially) probably be "giving five blocks to her pleases her, so does giving five pins, therefore it doesn't matter what things I give so long as there are five of them. To make the individual aware of his role in the relation there would clearly have to be some element of differentiation. For example we may arrange it that if the particular S gives her five blocks she gives reward but if some other S1 gives her five blocks she will not reward or will punish, "I'm not talking to you, is your name John?" So the phrase or the general situation will contain a cue signifying that only if John gives the blocks will the teacher be pleased. In the latter case the teacher may be looking at John; in the former case the phrase would be "John, would you give me five things please?" Subsequently, as a statement this would be phrased as "John gave the teacher 5 things".
Note 1 to page 14
As said elsewhere, in factor analysis it is the observed intercorrelations which form the raw data from which factors are derived. In an empirical sense therefore the intercorrelations are primary, the factors secondary. From the point of view of most factor analysts's theoretical model however the reverse is the case. Here it is the factors which are primary, the intercorrelations being secondary. Now remember that these factors are common components or elementary aspects and we're ready to use this same approach to the topics discussed above and to provisionally identified the common factors, (group and general) and specific factors with the entities described in discussions of conceptual behaviour as 'cues'. Now where there emerges a very general factor out of the factor analysis of an individual's sorting behaviour this may, on this hypothesis, be regarded as a cue which is held in common with a large number of different objects, situations, events and so on, the 'cue' here referring to some aspect-in-common, which is used as a sign that a certain (common) response will be rewarded or otherwise shown to be appropriate.
As a simple example consider the correlation between only two attributes (in the environment) which may be reflected in the correlation between two parallel constructs of the individual. (This is similar to the distinction between a class which is real or objective in the statistical sense only perhaps from consensual validation, and a concept which may reflect and parallel this so that e.g. we want to make the individuals conceptual behaviour come closer to that of the majority, so also with constructs which are merely an organisation of concepts as variables or attributes can be seen as organisations of classes. For example suppose we take a group of people and categorise them firstly in terms of whether they are 'heroic', or not 'heroic', then in terms of whether they are 'brave' or 'not brave'. There will be a decided, one would expect, correlation between these two sorts. This would be because some of the cues or attributes which make a person, or which make us regard a person as the one, are also some of the cues which make a person, or make us regard a person, as the other, e.g. valiant deeds done in wartime. In this case where a verbal label is involved we can also say that the meaning of the one term is similar to the other. In the case where the correlation is perfect and positive of course the two terms would have identical meanings. The same thing applies of course to sorting responses, (i.e. common responses) which are not verbal but skeletal-muscular, autonomic, and so on.
Balance
By this I mean that the question may not be e.g. "What thing is as good as this one", or, "these things (e.g. offered to the subject) are equally good", but may be instead "What thing, event etc is as bad as this is good?", (or the other way around). The situation in which this is likely to occur is when the pupil thinks to himself "to work for a week on this job is as bad as to get paid �18 is good, (but of course he doesn't need to actually say it.) So in this case the balance is exact, other things being equal he is as likely to refuse the job as to take it. To make him take the job some minute addition to the incentives or rewards offered is necessary.

Consider these points

1. Barter was a forerunner to the use of money, historically, presumably. This then might be a way of approaching the development of the ideas of money in the individual?
2. The simple proportion one sweet is good, two sweets are twice as good, has to be refined. In economics there is the law of diminishing returns. If we look at the matter in a very concrete manner, a child may be happy with one sweet, but as you keep adding one more the increase becomes less, as a proportion. We could even think of instead of just having a sweet, eating a sweet. Then as you become satiated, eating a sweet become less and less 'good', and may even swop its value completely, and become 'bad', as you approach the being sick stage.



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