A firm in a monopolistically competitive market can earn short-run profits but not long-run profits

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 third satellite?

A) $30 B) $27 C) $54 D) $6

Refer to Table 18-3. Given the following exchange rates in the above table, what are the exchange rates stated as U.S. dollars per Danish krone and U.S. dollars per EU euro respectively?

A) 0.02 dollars per krone and 0.70 dollars per euro B) 0.05 dollars per krone and 1.30 dollars per euro C) 2.00 dollars per krone and 7.14 dollars per euro D) 0.20 dollars per krone and 1.43 dollars per euro