Professor Mankiw's Pop Quiz: Who is #1?

A new Gallup poll:

"Which one of the following do you think is the leading economic power in the world today?"

China: 40 percent

The United States: 33 percent

Japan: 13 percent

The European Union: 7 percent

India: 2 percent

Russia: 2 percent

(psst...here's the answer key)