Why are people like Bill Gates, Jeff Bezos and Mark Zuckerberg so incredibly rich? Sure, they're great businesspeople, and they had the right ideas at the right time. But most importantly, when their businesses succeeded, they owned a large portion of the equity.
Equity, or stock, is the riskiest type of asset ownership. It's the most volatile, and it's the first to get wiped out when a company goes bankrupt. But it also has unlimited upside — the gains can, in theory, be infinite. It's the entire upper tail. So of course the largest fortunes that we see — the richest individuals — were made through equity ownership.
But the big payouts to other stockholders are also responsible for much of the vast increase in wealth inequality. In 1980, the richest 5% of Americans owned half of the country's wealth. In 2012, it was almost two-thirds:
Why has wealth become so concentrated at the top? One reason is certainly that income inequality has increased. People who make more money can also save more money, building wealth over time. Things like the estate tax, which work against the intergenerational transfer of wealth, have gone down, even as the chance of going from low-income to high-income has fallen; this means that the slow buildup of wealth by high earners can continue from generation to generation. Also, high earners tend to save more than the middle class, which increases the gap between the rate at which the two groups build wealth.
But this is only part of the story. There's another important factor that's often overlooked — the issue of who owns which type of financial assets. Wealthy people tend to own most of the equity in the economy. That means that when business does well, the rich reap disproportionate benefits.
At least two recent papers highlight this extremely important fact. The first is by Laurent Bach, Laurent Calvet and Paolo Sodini. Instead of looking at the U.S., they look at Sweden, because the Swedish government keeps much better data regarding the assets of the rich. Examining at the period from 2000 to 2007, they found that the middle class actually doesn't do too badly — though it holds more bonds and fewer stocks, the rich tend to do a bit worse with stock investing, taking extra risks that aren't matched by higher returns. This is evidence against the theory that the rich are more skilled investors.
But there's one big reason why the rich still come out ahead — instead of stocks, the middle class puts a large share of its wealth into residential real estate. Houses tend to earn lower returns than stocks.
