The main problem with using desalination to increase water supplies is that
a. There are few available sources
b. It is very expensive
c. Supplies are usually contaminated with pesticides
d. Water tends to evaporate before it can be used
e. Communities tend to be located too far from water supplies
Answer: b. It is very expensive
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If two variables are unrelated, a scatter diagram of those variables will
A) be a vertical line. B) be a horizontal line. C) be either a vertical or horizontal line. D) have a constant positive slope.
Refer to the above figure. Suppose the natural rate of unemployment is 5 percent. If the government tried to reduce unemployment to 4 percent and keep it there, it must
A) raise unemployment benefits. B) accept a permanent inflation rate of 1 percent. C) generate higher and higher inflation rates or else people will adjust their behavior and the unemployment rate will return to 5 percent. D) use contractionary fiscal and expansionary monetary policy.
Open-access resources tend to be
a. conserved b. taxed c. overused d. efficiently used e. used in an environmentally sound manner
What is the marginal cost associated with producing three units of the control variable, Q (identify point E in the table)?Control variableTotal BenefitsTotal CostsNet BenefitsMarginal BenefitMarginal CostMarginal Net BenefitQB(Q)C(Q)N(Q)MB(Q)MC(Q)MNB(Q)0000---190010080090010080021,700300C80020060032,4006001,800700E4004A1,0002,00060040020053,5001,5002,000500500F63,9002,1001,800D600-20074,2002,8001,400300700-40084,400B800200800-60094,5004,5000100900-800104,5005,500-1,00001,000-1,000
A. 200 B. 100 C. 50 D. 300