Public economics is the study of: ОООО
why people buy certain products.
the role of the government in the economy.
how much people work.
why people work.

I think the first one is the answer.

a. would be the answer : )

explanation:

the tariff was created to protect industry in the northern part of the united states. industries in the north were being driven out of business by imported goods that were priced at a low rate. the goal was to protect these industries   by taxing the goods.