Which of the following does NOT help explain why oligopolies exist?

Of the following, which is NOT a monetary policy rule the Fed could follow?

A) an unemployment rate targeting rule B) an inflation targeting rule C) a money targeting rule D) a k-percent rule E) a nominal GDP targeting rule

Which of the following is true?

A) Accounting profits = Revenues - Implicit costs - Explicit costs B) Economic profits = Revenues - Explicit costs C) Accounting profits = Revenues - Implicit costs D) Economic profits = Accounting profits - Implicit costs