Which of the following is an example of a proposition from positive economics?
a. If John Kerry had been elected president, tax-payers would have been treated more fairly than under George W. Bush.
b. The average rate of inflation was higher during George W. Bush’s presidency than during Bill Clinton’s presidency.
c. In economic terms, George W. Bush is a better president than Bill Clinton.
d. Bill Clinton’s policies were more just toward poor people than George W. Bush’s.