What is the term that describes an increase in output added by the most recent unit of input?

Amarginal utility
Bmarginal supply
Cmarginal demand
Dmarginal product of labor User: Goods and services intended for use by households are exchanged in
Afirms.
Bhouseholds.
Cinput markets.
Doutput markets.

Verified Answer :

The correct answer is d. marginal product of labor. In economics, the marginal product of labor (MPL) refers to the change  in output that is the result after employing an added unit of labor. 

Goods and services intended for use by households are exchanged in d. output markets.