2016_4. To understand metal money zero money and money tender (13p)

(p1)

(p2) 02
(p3) 03
(p4) 04
(p5) 05
(p6) 06
(p7) 07
(p8) 08
(p9) 09
(p10) 10
(p11) 11
(p12) 12
(p13) 13