When the bubble bursts, they fear, the whole thing could come crashing down.
But is this the week that the bubble bursts, as investors wake up to the fact that hot new stocks may prove as fragile as they were in the last dotcom boom?
When the bubble bursts, the convergence unravels.
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When the gold bubble bursts, will the government bail out the losers?
When the bond bubble bursts, it will be just as ugly as the collapse in housing and the stock market proved to be.
But for players in the NBA, NFL and Major League Baseball, the bubble never bursts.
Sceptics predict that these streams of money will soon dry up, once the Internet bubble bursts.
Will the general public take a huge hit if the gold bubble bursts?
Debt-laden American consumers, so the argument goes, will not be able to sustain their current spending patterns, particularly if the housing bubble bursts.
If (when) the tech bubble bursts, this will cause spending to slow sharply as firms and households struggle to reduce their heavy debt burdens.
When the bubble predictably bursts, get the Federal Reserve to pour trillions of dollars into the industry in a desperate attempt to reinflate the bubble.
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If the real estate bubble bursts, it may produce a rerun of 2008, when the Shanghai stock market plunged about 60%.
Whether or not the house-price bubble bursts this time around, the north-south house-price differential is already shrinking.
But from a policy view, no one was able to say, "Let's stop the bubble before it bursts', " he said.
There is every reason to think that it will continue to do so, even if the current property bubble bursts spectacularly.
When the bubble in government debt finally bursts under the pressure of rising rates and unsustainable interest expense, he said, the ratings agencies, as always, will be late to make the call.
But it might also mark the point at which the bubble in the market for Treasury securities bursts.
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For anybody who has noticed the giant amounts of money being paid for companies like Instagram and wants to get their piece of the tech bubble before it bursts, Google vice president of corporate development David Lawee has some advice for you.
But by letting some air out of the bubble sooner, the impact on inflation and output when it bursts is more modest.
When this bubble bursts, he will be forced to make the same choice.
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