Which of these is not a productive resource?
capital
entrepreneurship
labor
price

The likely answer to this may be price, because price doesn't produce anything, unlike labor or entrepreneurship.

Price

Explanation:

A Productive resource is a resource used for the production of goods and services and this includes various categories of resources like human resources, natural resources and capital resources and other types of productive measures.

An example of an unproductive resource is the price of the goods and services while examples of productive resource from the above mentioned resources are labor, entrepreneurship ( human resources ). and capital is part of the capital resources.  

john maynard keynes developed new economic theories in response to the stock market crash of 1929. great depression of the 1930s. first and second world wars. economic boom of the 1950s.