When the price of knee braces increased by 25 percent, the Brace Yourself Company increased its quantity supplied of knee braces per week by 75 percent. BYC's price elasticity of supply of knee braces is 0.33

In the United States between the 1970s and the 2000s, the productivity of labor increased. This increase led to

A) an increase in the demand for labor. B) no change in either the demand for or the supply of labor. C) a decrease in the supply of labor. D) a downward shift of the production function. E) an increase in the supply of labor.

The pricing rule MR=MC hold for

a. All firms b. Single product firms c. Multiple product firms d. None of the above