A valid and useful theory of gold prices:
A) helps to predict the movements of gold prices over time.
B) may be founded on simplifying assumptions.
C) need not exactly predict every change in gold prices.
D) all of the above
E) none of the above
D
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Oscar consumes only two goods, X and Y. Assume that Oscar is not at a corner solution, but he is maximizing utility. Which of the following is NOT necessarily true?
A) MRSxy = Px/Py. B) MUx/MUy = Px/Py. C) Px/Py = money income. D) Px/Py = slope of the indifference curve at the optimal choice. E) MUx/Px = MUy/Py.
If identical firms sell an undifferentiated product, advertising is likely to be
A) used to attack the rivals' products. B) collectively undertaken by the industry group. C) strategically aimed at deterring entry. D) focused on secret ingredients.