During the last half-century, the buying power of americans has and their self-reported personal happiness has
a. increased; remained almost unchanged.
b. remained almost unchanged; decreased.
c. remained almost unchanged; increased.
d. remained almost unchanged; remained almost unchanged.

Which of the following early north american cultures were known for building wigwams and longhouses? a. eastern cultures b. great plains cultures c. western cultures d. northern cultures

Of the following choices, which ones are characteristics of west african society? select all that apply. a. arabic was the main language used when trading with other societies. b. christianity was the only religion practiced in villages. c. slaves had no rights and were only given specific farming tasks. d. skilled workers were a higher level in the caste system than traders. e. religious rituals encouraged the honoring of ancestors.

Give an example of a situation in which an individual's pursuit of economic self-interest may not benefit but instead harm the rest of society