In a simple macroeconomic model, only one component of expenditures is allowed to change:

What does it mean when a good is rival in consumption?

a) One person's use of the good diminishes another person's ability to use it. b) People can be prevented from using the good. c) No more than one person can use the good at a time. d) Everyone will be excluded from obtaining the good.

Population growth is similar to depreciation, in that ________

A) each lowers the capital-labor ratio B) each tends to encourage saving C) capital wears out faster when used by more workers D) each helps to explain how economies can sustain a positive growth rate of output