In 2010, the medical specialty that earned the highest rate of return on investment was

The cost to firms of changing prices

A) is called a menu cost. B) is small even when there is rapid inflation. C) does not exist if inflation is perfectly anticipated. D) all of the above

We can find the market demand for pears by:

A. adding all the prices people are willing to pay for pears. B. multiplying the number of people times the price of pears. C. adding the number of pears that producers are willing to sell. D. adding the individual demand curves for pears.