Profit maximization can occur at some output level where marginal cost and marginal revenue are not equal

The figure above shows the loanable funds market. The equilibrium real interest rate is ________, and the equilibrium quantity of loanable funds is ________

A) 4 percent; $1.5 trillion B) 4 percent; $2.5 trillion C) 6 percent; $2.0 trillion D) 8 percent; $1.5 trillion E) 0 percent; $3.5 trillion

Which of the following statements is true of the long run?

A) Identical firms can enjoy positive economic profits. B) Identical firms face an upward-sloping supply curve. C) Non-identical firms can enjoy positive economic profits. D) Non-identical firms face a horizontal supply curve.