Which market structure(s) is(are) imperfectly competitive?

An economist who would most likely use active policy making would support which of the following conclusions?

A) Demand shocks have little or no short-run effects on real Gross Domestic Product (GDP) and unemployment. B) Pure competition is not typical in most markets. C) Price flexibility is common in most markets. D) Supply shocks explain most business cycles.

The demand for houses decreases, all else equal, when

A) wealth increases. B) real estate prices are expected to increase. C) stock prices become more volatile. D) gold prices are expected to increase.