Which of the following is a stock variable:

All of the following government actions create barriers to entry EXCEPT

A) limiting the number of airlines that may operate at an airport. B) granting a patent to a drug company. C) requiring a pizza parlor to get a business license. D) giving a power company exclusive use of the city's transmission lines.

The slope of a line is the

A) change in the values along the x-axis divided by the change in the values along the y-axis. B) values on the x-axis divided by the values on the y-axis. C) change in the values along the y-axis divided by the change in the values along the x-axis. D) values on the y-axis divided by the values on the x-axis.