The demand curve for bonds has the usual downward slope, indicating that at ________ prices of the bond, everything else equal, the ________ is higher

Which of the following statements is supported by the research of economic historians?

(a) Canals and railroads were built with a mixture of private and public enterprise and financing. (b) Canals and railroads were built largely without U.S. government participation. (c) Canals were built with public assistance, but railroads were built with almost no government assistance. (d) Railroads were built with public assistance, but canals were built by private enterprise.

A perfectly competitive firm may earn economic profits in

a. only the short run. b. only the long run. c. the short run and the long run. d. neither the short run nor the long run.