Describe the feudal system of labor practiced in europe from the 9th century into the late middle ages?

when in doubt choose c

it's what my teacher told my class when we were going into psats

john maynard keynes developed new economic theories in response to the : b) great depression of the 1930s. his theories are so important that they are known as "keynesianism". in his works he supports the idea of a government with deeper involvement and intervention to end the great depression.