The evolution of mathematics education during the last 30 years.
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1960's
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A peasant sells a bag of potatoes for $10.  His costs amount to 4/5 of his
selling price.  What is his profit?

1970's
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A farmer sells a bag of potatoes for $10.  His costs amount to 4/5 of his
selling price, i.e. $8.  What is his profit?

1970's (New Math)
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A farmer exchanges a set P of potatoes with a set M of money.  The cardinality
of the set M is equal to $10 and each element of M is worth $1.  Draw 10 big
dots representing the elements of M.

The set C of production costs is comprised of 2 big dots less than the set M.
Represent C as a subset of M and give the answer to the question: What is the
cardinality of the set of profits? (Draw everything in red).

1980's
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A farmer sells a bag of potatoes for $10.  His production costs are $8 and his
profit is $2.  Underline the word "potatoes" and discuss with your classmates.

1990's
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A kapitalist pigg undjustlee akires $2 on a sak of patatos.  Analiz this tekst
and sertch for erors in speling, contens, grandmar and ponctuassion, and
than ekspress your vioos regardeng this metid of geting ritch.

1990's (EEC)
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A farmer produces, at a cost of $8, a bag of potatoes which used to sell for 
$10 during the 1980's. However, he has produced so many potatoes that there
is no longer any demand, so he adds this bag to an ever increasing pile of
already rotting potatoes and the government gives him $14 in compensation.
Explain why social conditions were not ripe in previous decades for this
method of doing business to be effective.