An example of a supply shifter is:

The figure above shows Sam's budget line. Which of the following would result in Sam's budget line rotating inward and not changing its vertical intercept?

A) a decline in his preference for coffee B) a fall in the price of a gallon of gasoline C) a decrease in Sam's income D) an increase in the price of a pound of coffee

Two variables are said to be negatively correlated if their values

A. tend to move in opposite directions. B. tend to move in the same direction. C. are always negative. D. only decrease but never increase.