Greater fool theory comes back to haunt bitcoin and tech stocks: Don Pittis

So, when a speculativeinvestment plunges in value, where does the money go?

As bitcoin crashes to year-long lows, as tech stocks give up their entire 2018 gains and as global oil prices tumble to a level not seen since October 2017,it is common to hear investing being compared to playing roulette.

Sometimes, it's harder making the comparison when asset prices are on the way up. But that's whatBank of Canada governor Stephen Polozdid justas bitcoin was reachinga peak over $18,000 US.

"There is no intrinsic value for something like bitcoin, so it's not really an asset one can analyze," Canada's chief central banker said almost a year ago.

"It's just essentially speculative or gambling."

Conjured from thin air

"You're better off in Vegas;the food is better," joked cryptocurrencycritic Jeffrey Robinson in his own attack on cryptos, which he insisted wereneitherinvestmentsnor currencies.

This week, people who once turned their Canadian dollars into bitcoin may be wishing they had listened to Poloz and Robinson as the digital token plunged again to below $5,000 US.

It may not be hard to see money paid for bitcoin,a relatively recent inventionconjured out ofones and zeros, going back to the thin air from whence it came.

Digital currencies are relatively easyto write off as a foolish gamble. But in an era of casino capitalism,the fact is thatlosing money in Vegas mayactually be better for the economy than losing on speculative investments of any kind, whethercrypto, stocks or oil.

At least the money you lose at the card table or roulette wheel flows out of your pockets straight into someone else's. In casino capitalism, especially when asset values go through a synchronized decline, money can simply disappear from the economyaltogether not to return until some future day when those asset prices rise again.

Speaking on U.S. business network CNBC, Robinson, author ofBitCon: The Naked Truth About Bitcoinwarned that anyone interested in bitcoin should Google the greater fool theory, "because that's what they are all about."

Finding someone more foolish

Greater fool theory is the concept thatit mayvery well be wise to buy an asset that you know isfoolishly overvalued, so long as you are confident you can sell it on at a higher price to a greater fool. But that only works if you find that greater fool before asset prices decline.

And the concept is by no means limited to cryptocurrencies.

The hard fact is that assets with intrinsic value are also subject to the theory, something that occurred to me in a much earlier bitcoin era in 2013 when both gold and bitcoin were falling at around the same time.

Just how long ago that is in bitcoin valuation termscan be seen from the fact thatit had just "plummeted to about $50 after hitting a Wednesday high of about $260."

My conclusion in that case was not exactly originalin that there is an ancientmaxim in Roman law that says "Res tantum valet quantum vendi potest" which translates as "a good's only value is the amount you can sell it for."

Looked at individually, there are rational reasons why someone might want to pay less for bitcoin, stocks and oil.

Bitcoin is being investigated for price rigging.In the case of stocks, flat demand for Apple products and some bad financial results from retailers are offered as a reason for the decline. In the case of oil, high inventories are among the factors getting the blame for prices falling to theirlowest levels in a year.

The curse of Harry Potter

But the fact that they are all happening at the same time may be a sign of something elsea general and synchronizedgloom about assets that is the flip sideto therecent excess of euphoria.

Like the slap of a beaver tail,a warningin one market sector can act as signal to traders in otherparts of the pond.And despite repeated reminders that the market and the economy are two different things, a widespread loss of asset value from the economy can have an economicimpact.

The bitcoin chart "looks like the left-hand side of the Eiffel Tower, doesn't it?" said Poloza year ago, allowing us to imagine the other side of the tower.

Depending on how you construct your graph, you could have found similar Eiffel towers in various other stocks and markets.

Think back to thehappy man with the goatee and the hat who celebrated the Dow Jones Industrial Average climbing to 20,000 and through to 25,000 in the months after Donald Trump was elected president.

Now, various market analystsare beginning to talk about a supposed market phenomenon that sounds like a curse from the Harry Potter books. It'scalled the "death cross," which a quick internet search shows is currently being applied tooil, technology stocks and bitcoin.

"The death cross appears on a chart when a stock's short-term moving average crosses below its long-term moving average," says the investment education website Investopedia.

While the death cross has appeared before nasty bear markets,including in 1929, 1974 and 2008, it is unreliable, having also appeared at other times when markets actually recovered.

"For smaller corrections of less than 20 per cent," says Investopedia, "the temporary appearance of the death cross may be reflecting losses already booked, and thus indicates a buying opportunity."

Follow Don on Twitter @don_pittis