Market Extra: Here’s why retiring baby boomers won’t create a ‘stockmaggedon’ for millennials

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The retirement of the baby boomer generation is one of the biggest shifts currently happening in the U.S., carrying significant long-term implications for government spending and the labor market. But could it have an impact on the stock market?

Demographics have been cited as a concern by analysts, who see the aging population as an underappreciated headwind for equities.

The basic argument behind the theory is that as baby boomers retire, they will sell their equity exposure in favor of bonds, which are viewed as safer and income-generating investments. In 2016, those aged between 45 and 64 owned half of U.S. stocks, according to Vanguard, which cited data from the Federal Reserve Board’s Survey of Consumer Finances.

Meanwhile, the millennial generation, which hasn’t aggressively been buying equities, won’t be there to replace the older generation. According to the theory, that would mean a sharp decline in demand, the result of which is what Joe Davis, the chief economist of Vanguard, jokingly referred to as “Stockmaggedon!”

While Davis doesn’t believe this scenario is going to pass, it is worth noting that both sides of this “stock market horror story”—as he dubbed the theory—are playing out. According to Morgan Stanley, nearly $300 billion has been pulled from stock funds since 2007. More than $1.5 trillion has gone into fixed-income products over the same period. Alina Lamy, a senior analyst of financial markets at Morningstar, credited this rotation to demographic trends.

Read more: Despite Wall Street records, investors have been favoring bonds over stocks for years

At the same time, young investors tend to have low equity exposure, if they have any at all. This is partially due to factors like low income and high levels of student debt, but it is also related to millennials having grown up during both the bursting of the dot-com bubble and the financial crisis. According to an annual survey by Legg Mason, released in June 2017, 82% of millennial investors said their investment decisions were influenced by the financial crisis, while 57% said they were “strongly influenced” by the crisis. As a result, they are gun-shy about stocks: 85% of those polled said they were conservative with their investments, while 52% said they were “very conservative,” meaning they owned assets seen as safer.

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So, if the conditions are there for a ‘stockmageddon,’ why shouldn’t investors fear such an outcome?

For one thing, the baby boomer generation is typically defined as those born between the years of 1946 and 1964 (based on that, boomers range in age from 54—more than a decade from retirement—to 72). That 18-year span means “any asset rotation out of equities will be gradual,” Davis wrote. He also said other entities could step in to buy stocks if one generation of individual investors slows or reverses their purchases. Companies buying their own stock is the largest source of demand for stocks, while the percentage of the U.S. equity market capitalization held by overseas investors was 22.6% in 2016. That is up from 7.2% in 1988.

“Even if there were a connection between U.S. demographics and domestic stock market returns, international investors would dampen the impact,” Davis wrote (emphasis in original).

Beyond that, Vanguard’s chief economist disputed the idea that demographic issues had a notable impact on market returns. He cited an analysis from the U.S. Government Accountability Office, which showed that between 1948 and 2004, demographics “accounted for less than 6% of stock market return variability,” with macroeconomic and financial variables having a far larger impact.

“No significant relationship exists between the changing proportion of U.S. retirees and long-term stock market return variability,” he wrote. “The demographic changes occurring in the U.S. will have noticeable implications for labor markets, public finance, and political developments. However, Vanguard finds no credible evidence that demographic changes alone will negatively affect future stock returns.” (emphasis in original.)

Courtesy Vanguard

Davis has previously argued that the biggest economic trend that will be seen in the lifetime of most investors was the growing use of automation, robotics, and artificial-intelligence technologies, which he said had the potential to disrupt every aspect of the global economy. He has also speculated that there is a “decent probability” that the digital currency bitcoin BTCUSD, -4.50%  goes to zero.