Julie's total utility from cheeseburgers is given in the table above. What is the marginal utility of the third cheeseburger?

According to the classical model, desired saving is

A) affected by the money illusion at low income levels. B) identical to the demand for saving at each level of real GDP. C) a function of real GDP. D) equal to desired investment.

Suppose the demand function for a good is expressed as Q = 100 - 4p. If the good currently sells for $10, then the price elasticity of demand equals

A) -1.5. B) -0.67. C) -4. D) -2.5.