Bernie Sanders Could Be the Stock Market's Best Friend

(Bloomberg Opinion) -- Of all the candidates in the 2020 presidential field, including Donald Trump, the U.S. stock market's biggest booster might just be Bernie Sanders.

With Sanders's victory in the New Hampshire Democratic primary on Tuesday, questions about how the market would fare if the Vermont senator were elected president will intensify. The prevailing narrative is that his socialist bent would send the long-running bull market into retreat, but don't bank on it.

The narrative that Sanders and stocks don't mix is bolstered by the obvious fact that no one so openly hostile to free-market capitalism has ever occupied the White House. On that, Sanders has been shockingly consistent for decades. When asked whether he was a capitalist in a segment on the Today Show titled "Socialism in New England" in 1981, the newly elected mayor of Burlington, Vermont, shot back, "No, I'm not," a courageous admission in the heyday of the Reagan Revolution.

More recently, the narrative was reinforced by the market's moves around Elizabeth Warren's surge - and then collapse - in popularity last year. Warren, of course, is the other top Democratic candidate with an ambitious progressive agenda. As her popularity skyrocketed from May to September, so did the stock market's gyrations, leaving the S&P 500 Index range-bound during those five months. When Warren's fortunes nose-dived in October, the S&P 500 broke out, rising 8.5% during the fourth quarter.

But those are trivial reasons to fear Sanders. It's just as likely that the market's apparent reaction to Warren was purely coincidental. Also, even if elected, Sanders is unlikely to have the legislative muscle and popular support to remake the U.S. into a socialist oasis. That includes nationalizing broad swaths of the U.S. economy, as many fear he might do.

Instead, any serious attempt to anticipate how the market would perform during a Sanders presidency - acknowledging that market predictions are famously dicey - must answer two questions: What has propelled the U.S. stock market in recent years and what impact would Sanders realistically have on those forces?

Popular explanations for the current bull run that are even tangentially related to the president include the Federal Reserve's cheap money policy, President Trump's tax cuts and his rollback of federal regulations, but their impact is overstated.

As I pointed out recently, the vast majority of the S&P 500's 13.6% annual return during the last decade came from freakishly high earnings growth (10.2%, or 6.2% a year higher than the long-term average) and little came from valuation expansion (1%), so the availability of cheap money hasn't induced investors to pay meaningfully more for stocks.

And while Sanders would seek to reverse Trump's policies, lower taxes and deregulation haven't contributed much to the bull market, either. Most of the earnings growth that fueled higher stock prices was already in the books when Trump's tax cuts took effect in 2018. Also, many of the regulations targeted by the administration focus on the energy sector, which has struggled to grow earnings at all since the 2008 financial crisis.

An explanation that deserves more attention is deficit spending. Governments have long used deficits to bolster economic activity, and the annual federal deficits since 2009 have been the highest on record. Consider that from 1970 to 2008, roughly around the time that deficits became the norm, the average annual deficit was $129 billion. Since 2009, that average has jumped to $882 billion. More than any other single factor, that spike in deficit spending most likely fed the earnings growth behind this bull market.

And if you think deficits are high now, just wait for President Sanders. His long and expensive wish list includes health care, housing and college for all, not to mention an ambitious Green New Deal. Sure, some of the money may come from higher taxes, but no one doubts that much of it will be added to the nation's debt. One estimate pins the cost of Sanders's proposals at up to $97.5 trillion.

Stephanie Kelton, an economic adviser to the Sanders campaign, told Bloomberg TV recently that the U.S. could "safely increase the deficit, let's say by another $500 billion or so, before we begin to see inflation accelerating to something that we would consider problematic." Kelton has become the public face of Modern Monetary Theory, which posits that a country with its own currency, such as the U.S., can accumulate as much debt as it wants as long as inflation remains in check. Not surprisingly, the theory is increasingly popular with progressives who support big, Bernie-esque initiatives.

Additional deficits of $500 billion a year probably wouldn't be enough to pay for Sanders's proposals, so expect a Sanders administration to push MMT to its limits. What if all that spending sparks runaway inflation because supply can't keep up with demand? No one really knows because MMT is untried. But in a consumer-driven economy, cheaper health care, college and housing would free up money to spend elsewhere, even after accounting for modestly higher taxes on ordinary Americans, and U.S. companies would scramble to pick up the loose change.

It's anyone's guess what a huge increase in deficit spending would ultimately do to the U.S. economy, and there are legitimate reasons to worry about the unintended consequences of a debt-fueled experiment. But in the near term, don't be surprised if all that spending continued to juice corporate earnings and the U.S. stock market.

To contact the author of this story: Nir Kaissar at

To contact the editor responsible for this story: Daniel Niemi at

This column does not necessarily reflect the opinion of Bloomberg LP and its owners.

Nir Kaissar is a Bloomberg Opinion columnist covering the markets. He is the founder of Unison Advisors, an asset management firm. He has worked as a lawyer at Sullivan & Cromwell and a consultant at Ernst & Young.

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