[简答题]Suppose you are driving on a highway with three lanes going in your direction and you come upon a toll plaza with six toll booths. Three toll booths are straight ahead in the three lanes of traffic, and the three other booths are off to the right. Which lane should you choose (86) There are usually enough people searching for the shortest line so as to make all the lines about the same length. 　　The term profit in economics has a very precise meaning. Economists, however, often loosely refer to “good deals” or profitable ventures with no risk as profit opportunities. Using the term loosely, a profit opportunity exists at the toll booths in one line is shorter than the others. The general view of economics is that profit opportunities are rare. At any one time there are many people searching for such opportunities, and as a consequence few exist. 　　At major banks in big cities, you can buy foreign currencies. The prices of these currencies are determined in world money market. With