Economic models cannot take the form of

Physical currency is ________ popular than e-cash, ________

A) less; and both are portable and recognizable B) more; and both are portable and recognizable C) more; but only physical currency is portable and recognizable D) more; and both are portable, untraceable and anonymous E) less; but both are portable, untraceable and anonymous

Effective cooperation among the members of a commercial society is more likely when

A) economic decisions are placed in the hands of democratically-elected committees. B) everyone's income is approximately the same. C) people produce for use rather than for profit. D) prices do not change in response to temporary changes in circumstances. E) property rights are clearly defined.