The prudent sit on the sidelines. Optimists recognise the froth, but hope to get out in time by selling to a greater fool before the bubble pops. Those greater fools insist it is different this time and high valuations are justified by great opportunities.
謹慎者置身事外。樂觀者看出有泡沫，但指望能及時離場，在泡沫破滅之前讓更大的傻瓜接棒。而更大的傻瓜堅持認為，這次不一樣，高估值得到重大機遇的支撐。
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