Suppose the blue curve in the following graph shows the tradeoff between security and tourism; that is, combinations of security and tourism above the blue curve are not possible, and those on or below the curve are possible.

The vertical axis measures security, defined as the probability that a terrorist is intercepted before entering the country. The horizontal axis measures the number of yearly visitors to the United States, in millions.

Question

Suppose the blue curve in the following graph shows the tradeoff between security and tourism; that is, combinations of security and tourism above the blue curve are not possible, and those on or below the curve are possible. 

The vertical axis measures security, defined as the probability that a terrorist is intercepted before entering the country. The horizontal axis measures the number of yearly visitors to the United States, in millions.

anonymous · Answer

Suppose that before 9/11, the situation was the one indicated by point A; that is, there were 55 million visitors per year, and the probability of intercepting any particular terrorist at customs and immigration was 10%. 
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