Amixed-market economy is best defined as an economy

A mixed-market economy is best defined as an economy "with some government intervention".

Mixed market economy is a monetary framework in which both the private sector and a level of state imposing business model coincide. Every present day economy is mixed where the methods for production are shared between the private and public divisions. Since a mixed economy incorporates a blend of both private and government control, it reflects attributes of both capitalism and socialism.

answer would be b, a tariffs main purpose is to protect domestic production and jobs.