The answer would be mixed economy
The main reason why the twenties are sometimes called an "age of prosperity", especially in the United States, is that "<span>A.Incomes throughout the United States grew and the middle class held most of the wealth," due mostly to speculation in the stock market. </span>
It used motivational framing. The idea behind it is that it should motivate you to say no to drugs especially since many young adults who try drugs do it because they are pressured into it by their peers. The main idea was that they should say no instead of succumbing to the pressure.<span />
I believe the centers of learning and art in the early middle ages were in monasteries.