What kind of market runs most efficiently when one large firm supplies all of the output?

Jaynet spends $30,000 per year on painting supplies and storage space. she recently received two job offers from a famous marketing firm – one offer was for $85,000 per year, and the other was for $120,000. however, she turned both jobs down to continue a painting career. if jaynet sells 40 paintings per year at a price of $4,000 each:

Amarket that consists of all possible consumers regardless of their specific needs or wants is a

Which of the following has the largest impact on opportunity cost