So what does bitcoin look like as an asset class right now, and how should investors treat it?
If it's an asset class, it's an incredibly volatile one.
According to an analysis of bitcoin prices performed for The Wall Street Journal by Mr. Harvey, between late 2010 and Wednesday, bitcoin's return in U.S. dollars had an annualized "standard deviation" of about 139%. That means it was roughly 7½ times as volatile as gold and more than eight times as volatile as the S&P 500.
Since last Friday, when bitcoin cost $411, the price of a bitcoin has fallen as low as $387 and risen as high as $782, according to CoinDesk.com, which averages bitcoin prices across multiple exchanges.
Marie Brière, an associate professor at Université Paris Dauphine in France, calculated that between July 2010 and July 2013, bitcoin had an annualized return of more than 370% with 175% volatility. She found that its returns had a weak but significant correlation with gold and inflation-linked bonds, supporting the notion that some investors see bitcoin as an inflation fighter.
Her paper, which was co-authored by Kim Oosterlinck and Ariane Szafarz of the Université Libre de Bruxelles in Belgium, concluded that a small allocation to bitcoin—perhaps 3% of a well-diversified portfolio—could improve one's risk-return trade-off.
But that study was conducted when bitcoin was merely four years old, and even Ms. Brière says investors will have to wait and see which, if any, of bitcoin's characteristics persist.
"I'd be very cautious. Is this a bubble or not? That's very hard to determine at this point," she says.
And yet some firms are already trying to make it easier for investors to get involved.
Cameron and Tyler Winklevoss, of Facebook fame, have filed with the Securities and Exchange Commission to launch an exchange-traded fund, called the Winklevoss Bitcoin Trust, that holds bitcoins. In an email from their lawyer, the Winklevosses said they are working with the SEC to finalize the proposal and hope to launch next year.
SecondMarket, a platform for investing in private assets, has already launched a private fund called the Bitcoin Investment Trust, which holds bitcoins. It charges 2% yearly in management fees and is open only to accredited investors, which for a single person means more than $200,000 in income or $1 million in assets, excluding a primary home.
SecondMarket CEO Barry Silbert says the trust, which is available in certain self-directed individual retirement accounts, has gathered $36 million in assets as of Thursday.
He says that some family offices have made investments and seem to treat it as a small part of their gold allocation or their "risky alternatives" allocation, which includes investments such as hedge funds.
Bitcoin "has a binary outcome," says Mr. Silbert. "There will either be a total loss of principal or a very, very high return."
What to Do
Bitcoin's all-or-nothing nature probably means that investors shouldn't treat it as they would a normal asset class at all and instead think of it as they would a "tail-risk option"—one that pays off only if an extremely unlikely event occurs, says Mr. Pal, the former hedge-fund manager.
Again, in layman's terms, that essentially means that bitcoin is like a lottery ticket. Taking a tiny risk won't damage a portfolio if bitcoin goes bust, but will have a sizable impact if it takes off.
What could that payoff be? And what's the chance of success?
Unfortunately, there's no way to know either answer. Mr. Pal believes that if investors do tie bitcoin's price to that of gold, one bitcoin could be worth $1 million. He says that even using a "conservative" estimate of $200,000, the price of bitcoin, at under $1,000, seems to factor in only a slight chance of the coins being equated to gold.
Mr. Pal says he thinks the probability is much higher. As a result, he's put a small slice of his portfolio—between 1% and 2%—into the coins.
"There's no basis to be sure what bitcoin's value will be or if it will even have a value," says Lawrence H. White, an economist at George Mason University, adding that he thinks its value is probably more closely tied to its role in the remittance market than as a gold substitute.
Take note: Bitcoins aren't useful as a way to avoid taxes—legally, at least. This summer, the Government Accountability Office said that income earned through virtual currencies is taxable. Some issues remain to be clarified, such as whether gains should be taxed in the same way as those from commodities or a collectibles.
There are many places where an investor can buy a bitcoin—or even a fraction of one, including Bitstamp and Coinbase. The minimum purchase at Coinbase is 10 cents.
Investors should think of bitcoins as a long-term speculation rather than a short-term trade or a long-term investment, says Mr. Pal. If you decide to take the risk, you shouldn't base your buying and selling on the gyrations of the market or invest more than the tiniest fraction of a portfolio that can be completely lost.
As bitcoin mania unfolds, the currency might turn out to be merely a speculative bubble that bursts as investors lose interest, akin to tulips in the 1600s. But by risking very little, at the very least, an investor might be part of a story that's still told nearly 400 years later.
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