Anyone paying attention to finance, markets and the economy doesn't have to look very hard to find complaints that we are on the cusp of a bubble of one type or another.

Perhaps the area most often targeted by the bubble believers is tech. I was curious about just how widespread this belief is: “Tech bubble” has doubled on Google Trends this year alone; Google News generates more than 3.6 million hits for the phrase.

Defining a bubble isn't too hard and one will do as good as another. “A market phenomenon characterized by surges in asset prices to levels significantly above the fundamental value of that asset. Bubbles are often hard to detect in real time because there is disagreement over the fundamental value of the asset,” Nasdaq says. 

So let's turn to the pro-bubble argument: It has been a decade since the financial crisis and two decades since the dot-com implosion. That's enough time for people to have forgotten the trauma of that disaster. Since the Great Recession ended, there has been too much capital sloshing around, leading to excessive tech valuations. And not just in public equities, but in private markets, too. Unicorns and other SoftBank Vision Fund debacles have imploded, an early warning sign for publicly traded companies, the argument goes.

Central banks have made the bubble worse, providing cheap capital that has artificially inflated profits. The bubble advocates also urge us not to overlook the impact of these low borrowing costs on the surge in share buybacks; reducing the total amount of a public company’s shares outstanding has the effect of making earnings per share look better.

Then there are the anecdotes: Tesla’s stock has more than doubled in the past three months, and the company now has a market value of more than $165 billion -- higher than Volkswagen, General Motors and Ford combined. This is to say nothing of the companies valued at more than $1 trillion, such as Apple, Microsoft, Amazon and Google parent Alphabet. But let's also be generous and acknowledge that some things do look overvalued, whether it's Bitcoin (maybe), WeWork (obviously) or Tesla (I'm not getting in the middle of that one).

But here's the thing: None of that is proof of a stock-market bubble. Let's look at some themes and issues to demonstrate why this is so:

Business models: In the 1990s, the internet captivated the collective imagination of investors, too many of whom indiscriminately threw cash at anything with dot-com attached to it. The 2000 collapse taught investors that it took more than a high-concept idea to make a stock worth buying: growth and future cash flow matter a lot, too. The collapse of WeWork’s initial public offering last year brought this home once again. Investors realized that renting out office space short term while locking the company into long-term, expensive real-estate leases was a terrible business model. Public investors grasped this flaw -- something private investors seemingly failed to understand -- and the market worked the way it's supposed to.

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