To an economist, theory can be thought of as
a. abstraction for the sake of argument.
b. one person’s opinion, which is just as good as another’s.
c. another term for the description of a situation.
d. beliefs which cannot necessarily be verified.
e. explanation of mechanisms behind observed phenomena.
Part of the pollution problem is due to
a. the absence of markets for goods like clean air and clean water.
b. the lack of well-defined property rights to clean air and clean water.
c. the unreliability of voluntary programs to cut pollution.
d. All of the above are correct.