People who focus on the forces in society that promote competition and change employ the
a. conflict perspective.
b. functionalist perspective.
c. interactionist perspective.
d. dysfunctionalist perspective.

People who focus on the forces in society which promote competition and change employ the conflict perspective - a. 

The conflict perspective is a commonly considered perspective in sociology which dictates that conflict and competition are common factors underlying social change and growth.

In financial aspects, a depression is a sustained, long haul downturn in monetary movement in one or more economies. it is a more extreme monetary downturn than a recession, which is a slowdown in financial action through the span of a typical business cycle. a depression is an irregular and extreme type of recession. so depression is always followed by recession but it is not correct to state that a depression always follow a recession.