An increase in autonomous consumer expenditure causes the equilibrium level of aggregate output to ________ at any given interest rate and shifts the ________ curve to the ________, everything else held constant

Refer to the figure above. If the monopolist faces a constant marginal cost of $2, what is the optimal quantity that it should produce?

A) 20 units B) 40 units C) 45 units D) 80 units

If a country produces good Y (measured on the vertical axis) and good X (measured on the horizontal axis), then the absolute value of the slope of its production possibility frontier is equal to

A) the opportunity cost of good X. B) the price of good X divided by the price of good Y. C) the price of good Y divided by the price of good X. D) the opportunity cost of good Y. E) the cost of capital (assuming that good Y is capital intensive) divided by the cost of labor.