When variable A rises by 10 units, variable B rises by 15 units. The slope of the line describing this relationship is
a. always 2/3.
b. either 2/3 or 1.5, depending on which variable goes on which axis of the graph.
c. either 1.5 or ?1.5, depending on which variable goes on which axis.
d. always ?1.5.
b
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If the growth rate for GDP was 9 percent and GDP in year 1 was 100, then GDP in year 2 would be
A) 90. B) 109. C) 190. D) 199.
Refer to Figure 16-6. If Sensei charges the competitive price for his classes, what is the maximum amount of admission fee that he can collect from his customers?
A) the area A + C + D + G + H B) the area A + B C) the area A + B + C + D D) the area A + B + C + D + E
The ceteris paribus assumption is important in economics because
A) all empirical data are equal. B) it would be impossible to relate the changes in one variable to another variable without holding other variables constant. C) economic data move very slowly over time and so they can always be considered constant. D) models are always complex and require as many variables as possible.
Refer to the information provided in Figure 10.2 below to answer the question(s) that follow. 
Figure 10.2 Refer to Figure 10.2. This firm's marginal cost curve has shifted from MC0 to MC1. A profit-maximizing firm should ________ the amount of output produced and ________ its demand for labor.
A. increase; decrease B. decrease; decrease C. keep constant; increase D. increase; increase