If everyone's gone crazy, economic theory isn't much help.
Economic theory will not be of use if everyone has gone crazy.
Economic theory is the best solution, if everyone has gone crazy.
A person is sad that the fountain is broken.
A rock climber is climbing a large rock.
They always appear to be easy.
I have heard that cats are now extinct.
CO2 has never been regulated as a pollutant under the Clean Air Act.
A man with dirty shoes walks up to a shoeshine stand.