In one year, a weapons plant can manufacture either 1,000 more guns or 50 more tanks. The plant's opportunity cost of an extra tank is approximately

There is no single market structure where firms offer either differentiated or identical products

Indicate whether the statement is true or false

A student at New York University used to take the Redhound bus when she visited her grandmother in Boston

After graduating, although the bus fare and the plane fare were the same as they were when she was a student, with a well-paid job on Wall Street she now takes the plane to Boston to visit her grandmother. For this student, travel by Redhound bus is A) a normal good. B) an inferior good. C) a substitute good. D) a complement good. E) a good with negative preferences.