Trina's Tropical Fish Store sells goldfish for $2 each and angelfish for $10 each. What is the opportunity cost of buying a goldfish?

If gold is used as money in an economy, the money supply is easy to control

Indicate whether the statement is true or false

In perfect competition, marginal revenue, average revenue, and ______ are all equal.

a. percentage revenue b. quantity c. total revenue d. price