When a firm sells a good or a service, the sale contributes to the nation’s income ___

When a firm sells a good or a service, the sale contributes to the nation’s income __________.
A.  only if the buyer of the good or service is a household or another firm
B.  We have to know whether the item being sold is a good or a service in order to answer the question
C.  only if the buyer of the good or service is a household
D.  whether the buyer of the good or a service is a household, another firm, or the government

 

Solution