other things held constant.
d. can be calculated even if individual demand curves are unknown.
Which of the following observations is true?
a. In the long run, more costs become variable.
b. Fixed costs can be completely varied if the time period is sufficient.
c. Fixed costs arise when some types of inputs can be bought only in big batches.
d. Variable costs arise when inputs have a large productive capacity.
Economists favor a negative income tax because they believe
a. that it will create more jobs for economists to monitor the program.
b. the current welfare programs have excessively high work incentives, which result in
less total work.
c. it is more efficient than the existing welfare system because NIT provides better work
incentives.
d. All of the above are true.