Which of the following BEST explains why the 1920's were known as the “roaring twenties?" a. Foreign trade prospered after WWI

b. The US assumed a leadership role in world affairs.

c. Political reforms made government more democratic

d. Widespread social and economic change occurred.

Why are the majority of the world's economies mixed? what may happen to the "pure" types of economies (traditional, socialist/command, market capitalist) when they incorporate elements from other economic models?

Martha participates in a research study in order to receive extra credit for her psychology class. when she arrives in the research office she is given a can of what looks and tastes like beer, but which actually contains no alcohol. in the adjoining room martha's classmate karen is also participating in the study. karen receives a can of alcoholic beer. if the experiment was designed to test the effects of alcohol on concentration, then who is exposed to the independent variable?

Identify a strategy for improving self-perception and the perception of others.