Consider a town with three residents. The residents' demand curves for various acres of a public park are shown below.Suppose the town can purchase land for the park at a cost of $20 per acre. The optimal park size would be ________ acres.  

Which of the following items would NOT be in U.S. GDP this quarter?

A. a dress produced and sold in Dallas, Texas this month B. a crane that was produced and sold as new two years ago C. a plane produced by Boeing this month that was sold in Europe to Air France D. a just-completed new home is sold to a household

During one winter quarter at Frozen U., snow falls every Friday night. Students assume that, on their campus, Fridays cause snow. This hypothesis

a. should more properly be considered a theory. b. assumes that correlation implies causation. c. assumes that causation implies correlation. d. reflects the fallacy of composition.