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An investment of $1,000 in bitcoin in 2010 would be worth more than $38 million today, not $38 billion, as an earlier version of this column mistakenly stated.

$1,000 $2,000 or $3,000. Heck, it could be up to $10,000 by the end of the month, and carry on climbing from there. While most markets around the world are mildly positive for this year, the cryptocurrency bitcoin has gone through the roof. At $2,400 it has more than doubled in value this year alone, and it is hitting fresh highs almost every day.

But hold on. Bitcoins themselves may be very new, yet that kind of price action is very old. In truth, it is starting to look like a bubble, and that should be making investors everywhere feel nervous. Why? Because it tells us that financial crazes are back. Because it will lead to overinvestment and wild speculation. And because bubbles inevitably crash and once that happens, the losses can ripple out in unexpected ways.

Also read: 4 reasons bitcoin still isnt mainstream

If you were lucky enough, or smart enough, to load up on some bitcoins early, you will be feeling a lot wealthier heading into the summer.

On Monday, the value of bitcoin BTCUSD, +9.47% raced up close to $2,200, an all-time high. By Wednesday it was soaring over $2,400.

If you had put $1,000 in the electronic currency in 2010, it would be worth an extraordinary $38 million (up from $35 million on Monday and compared to $2,500 if you had put it into the S&P 500 SPX, +0.25% ). Not many people were ever going to be that quick off the mark, but if you had loaded up on a few when the price last crashed in 2014 you would have almost quadrupled your money. In the last month alone, the price has risen by 87%, and there is little sign of it stopping there.

There are plenty of solid reasons why bitcoins are going up in price. It is growing in importance, along with other cryptocurrencies, as more and more companies accept it as a means of payment, and as regulators start to accept it as a legitimate investment. It may well start to break out of a small techno world, and become a mainstream asset, like the dollar, or equities, gold or bonds.

Even so, 87% in a month is not a normal price movement. In reality, no one really needs to spend time debating whether its a bubble or not. It is just obvious. The interesting question is what will be the consequences of that, and how much damage it might do when it bursts.

On one level, the answer might be not much. For all the hype and hoopla around electronic currencies, they are not yet a huge financial deal. There are 16 million bitcoins out there, and they currently have a combined value of $35 billion.

Okay, so that might be $40 billion or even $50 billion by the time you get around to reading this far, but in the context of the global capital markets that is not a huge sum.

Apple AAPL, -0.30% has a market value of $805 billion. All the gold in the world has an estimated combined price of $8.2 trillion. The United States bond market is worth an estimated $31 trillion. Bitcoin is hardly that important. Associated British Foods ABF, +0.03% , a relatively dull company you have probably never heard of, is worth about the same as all the bitcoins put together and the markets would not crash if it went pop.

On another level, however, the bubble could matter a lot. Here are three reasons why it should be making investors, whether they have any cryptocurrencies in their portfolio or not, feel anxious.

First, like any mania, it will lead to overinvestment, and that will lead to a misallocation of capital. Only this month, a company called RSK Labs raised $3.5 million for a bitcoin smart contract. Coinbase, a digital wallet startup, raised $75 million in funding.

Anyone who has time on their hands this week might want to try rolling up to a venture capital fund with a whizzy idea for a bitcoin something-or-other. They will probably walk out with $10 million, and a promise of more funding when that is used up. Sure, some of those will be great ideas, and go on to make everyone a lot of money. But a lot of them will flimsy and unpractical and will burn though a lot of cash that could have been more usefully deployed elsewhere.

Next, it tells us that manias are back.

In any long bull market, there are always one or two assets where the price goes completely crazy. It might be dot-com stocks, or space exploration companies, or apartments in central London, or hedge-fund managers, or if you go back far enough, radio shares, or South American railway companies.

But it is always something. If there is an asset bubble underway, it surely tells us that we are close to the peak of a bull market and sooner or later, that will turn down.

Finally, if bitcoin crashes, it might not do that much damage. $30 billion can disappear without leaving much of a trace in the capital markets. The worrying point is this. Bitcoin is not just any old asset. It is also money, if not of the conventional sort.

As we learned in 2008 and 2009 when a part of the financial system starts to crumble, suddenly the whole edifice starts to look pretty shaky. We dont really know what contracts have been linked to cryptocurrencies, what derivatives have been hitched to them, or how deeply they have been embedded into the financial system. One thing is for sure, though. In a crash, we would find out very quickly and the losses might ripple out in all unexpected ways.

Right now, bitcoin is on a roll. We have no way of knowing what its real value might be. The peak of a run might well be some way off. But when a crash comes, it wont just be its holders who feel the pain.

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Opinion: Three reasons to fear the coming crash in bitcoins - MarketWatch