An environmental group works to pass legislation that would decrease air pollution. An individual who does not contribute to the group but nonetheless enjoys the benefits of breathing clean air illustrates the __________ problem

An advantage of an interrupted time series design is that it permits

a. the researcher to make baseline measurements. b. the researcher to collect data without active manipulation of an independent variable. c. eliminates the history threat to internal validity because of the multiple measurements. d. a design that combines counterbalancing to offset the possibility of asymmetric transfer.

The tragedy of the commons for capitalism is ______.

A. the limited amount of profit B. the competition between capitalists C. the limited amount of governmental resources D. the overexploitation of the workers in the pool of labor