In order for the economy to be strong, individuals must
a.

produce goods and pay workers
b.

provide labor and pay workers
c.

produce goods and buy goods
d.

provide labor and buy goods

b

Explanation:

food chain i would say only because there is competition on getting food and survival

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.