Answer:
The Consumer Price Index (CPI) is a measure of the average change overtime in the prices paid by urban consumers for a market basket of consumer goods and services
I don't know the movement but it was led by humanists so I'm guessing the humanist movement
There was a large desire for slaves because these slaves didn't need to be paid, as long as they were fed, they would be able to work for any amount of time for next to no cost at all.
Salt for gold
(hope that helps)
