by Noah Smith
Why are interest rates so low? For macroeconomists, this is one of the Big Questions in the world today.
Government bond rates are at or near record lows all around the world. So are corporate bond rates, including junk bonds. Even the cost of equity capital is at or near an all-time low for most businesses. Whether you’re a government, a big corporation or a tiny startup, it has never been cheaper to obtain capital.
Interest rates of all kinds have been in decline since the early 1980s. For a while, that looked like a simple regression to the mean. The early '80s saw central banks tighten a lot, driving up rates in an effort to rein in inflation. But the decline that we’ve seen during the past 15 years or so -- and especially since the financial crisis -- goes way beyond a simple normalization.
Something unusual is happening.
That’s worrying for macroeconomists, because it means that old theories may be wrong. It’s also worrying for central bankers because it constrains their actions (nominal interest rates can’t be pushed below zero) even as it increases the uncertainty under which they are forced to make their decisions.
So why are rates so bizarrely low? Interest rates are set in markets, where borrowers meet lenders (broadly defined). Any explanation for falling rates must involve an increased desire to lend, a decreased desire to borrow, or both.
One common theory is that central banks are responsible. This makes sense to most people, since we all hear that the Federal Reserve, or the Bank of Japan, has a policy of holding interest rates near zero. But just because central banks are setting their rate targets at zero doesn’t mean that they have to work very hard to achieve that target. If private markets are trending toward low interest rates on their own, it means that central banks have basically been a sideshow.
In other words, the Fed may be a little like the annoying younger brother who tells you to “keep breathing,” and then gloats about how he made you obey him.
There are reasons to think that central banks are not the big driver of low rates. First of all, it isn’t just nominal rates that are historically low, but real inflation-adjusted rates as well. Most economists believe that real interest rates can’t be affected by monetary policy for very long.
Another reason for low rates -- an underrated reason, I suspect -- could come from the demand side of the equation. The desire to borrow money clearly seems low across the world.
Households in the U.S. and other countries that suffered a big housing bust have large overhangs of debt, and the crash showed them that debt was more dangerous than they had realized. Companies in Europe are clearly reluctant to borrow to invest, given the running political uncertainty surrounding the euro and the sovereign debts of countries such as Greece. That probably applies to Japan as well. In addition, these rich countries have steeply declining populations, and shrinking domestic markets discourage companies from expanding.
As long as private markets keep pushing rates down, central bankers are not going to risk causing recessions by attempting to raise them. Nor are companies going to suddenly become brave and bold around the world.
There are some factors that may stop the downward slide. American households will eventually work off their debt overhang -- already, the housing market is recovering. At the same time, China is also rebalancing toward a more consumption-based economy. That should do a bit to drain the savings glut, at least when China’s current sharp slowdown has run its course.
But long-term trends -- declining global population growth and continued technological disruption -- point to a very long period of low interest rates.