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"There will always be bears, and there will always be bulls, but one can never know when one will dominate the other." This quote by noted economist William Urster efficiently summarizes the economic theory of market cycles, in which periods of economic growth must inevitably be followed by periods of downturn, and vice versa. These respective periods play off one another, reinforcing a positive trend of growth over the long term. It is a tradition on Wall Street to refer to periods of sustained economic loss and recession as "bear" markets. The name is derived from the way a bear attacks its prey, by swinging downward with its claws, thus indicating the market's downward charted trend. The "bull" market, however, is construed as following the upward motion a bull uses to attack its enemy with its horns, signaling an upward trend for the economy. As the bear and the bull do battle, the investors find the economy quite unpredictable, and thus hard to apply the time-honored philosophy of buying stocks when the market is low, so as to sell when the market is high, at a substantial profit. Such market timing is not necessary, however. Over the history of the American stock exchange, the long-term pattern for the economy has always been up. In fact, the American economy, as gauged by the Standard and Poor's Index, has grown at an astounding 11% average per year. Thus, by simply investing at an appropriate time and keeping one's money in the market, long-term investors who can stomach the roller-coaster ride through the down periods will come out much richer for it in the long run. Few seem to have the patience and discipline to think about long-term investment in the market, however. Most people prefer to gamble instead, by hopping in and out of stocks, hoping to catch the buy at the lowest point and the sell at the highest. It has been statistically proven, however, that such short-term trading tends to result in losses over time. Aside from losses due to bad sales, tax consequences and brokerage fees chip away at these short-sighted traders' pockets, reinforcing the lesson. "Patience is a virtue," it's said, and the stock market certainly provides no exception.
单选题16.It is argued that the least successful investors are those who______.