Consider the following simple regression model y = 
0 + 1x1 + u. Suppose z is an instrument for x. Which of the following conditions denotes instrument relevance?
A. Cov(z,u) > 0
B. Cov(z,u) < 0
C. Cov(z,x) 
0
D. Cov(z,x z) = 0
Answer: C
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What would be an example of consumption service?
A) Rhianna gets a haircut. B) Jake buys an iPhone. C) Antonio, the manager of the local Taco Hut, purchases a new deep fryer. D) The local driver's license office purchases a new digital camera and printer. E) Donald Trump purchases furniture for his office.
An increase in the monetary base that goes into currency is ________, while an increase that goes into deposits is ________
A) multiplied; multiplied B) not multiplied; multiplied C) multiplied; not multiplied D) not multiplied; not multiplied
If the marginal rate of substitution of butter and margarine is constant, the indifference curve is likely to be _____
a. linear b. concave from below c. L-shaped d. U-shaped
When price exceeds average variable cost in the short run, a competitive firm's marginal cost curve is regarded as its supply curve because
a. the position of the marginal cost curve determines the price for which the firm should sell its product. b. among the various cost curves, the marginal cost curve is the only one that slopes upward. c. the marginal cost curve determines the quantity of output the firm is willing to supply at any price. d. the firm is aware that marginal revenue must exceed marginal cost in order for profit to be maximized.