Tom and Jerry are the only members of society. The table above shows their marginal benefits from defense satellites, a public good. What is the marginal benefit to society from the fourth satellite?

On average, about ___% of travelers get some form of expedited screening, including instances like less-intrusive scanning of elderly travelers in non-PreCheck lanes.

Fill in the blank(s) with the appropriate word(s).

What is the income approach to measuring GDP?

What will be an ideal response?