If the quantity desired of something exceeds the amount available at zero price, that item is called

The total willingness to pay for public restrooms in a city is given in the table below:

Number of Restrooms Total willingness to pay 1 $208,000 2 $199,000 3 $150,000 4 $85,000 If the marginal cost of building a public restroom is $208,000, how many restrooms will be built? A) 1 B) 2 C) 3 D) 4

In the terminology of macroeconomics, what's the difference between a saver and an investor?