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               Congressional
           a   Research Service






Low Interest Rates, Part 3: Potential Causes



March 15, 2019
Interest rates have been unusually low by historical standards since the 2007-2009 financial crisis, as
discussed in CRS Insight IN 11044, Low Interest Rates, Part 1: Economic and Fiscal Implications, by
Marc Labonte. This Insight discusses various theories of why rates have been low.


Nominal Versus Real Rates

Part of the reason why nominal interest rates (the stated rate familiar to most people) have been low is
because inflation has been low since the crisis. Because inflation erodes the value of the return to an
investment, it is common to adjust interest rates for inflation. Even when this adjustment is made, the
resulting real interest rates are still low by historical standards, as discussed in Part 1. The rest of this
Insight focuses on explanations of why real rates have been low.
Low  inflation may also be affecting real rates. Investors and households may now expect that inflation
will remain low in the future. If they perceive there to be less risk of future inflation, they may demand
less compensation to protect against inflation risk, resulting in lower real interest rates. The fact that real
rates were high in the 1980s after inflation became high permits inference that this phenomenon may now
be working in reverse.


Potential Causes

As Part I discussed, both short-term and long-term interest rates have been low since the crisis. The
Federal Reserve's monetary policy decisions are the main determinant of short-term interest rates, as
discussed in CRS Insight IN 11056, Low Interest Rates, Part 2: Implications for the Federal Reserve, by
Marc Labonte. If the Fed were keeping rates artificially low, however, inflation would be expected to rise,
but it has not. Moreover, monetary policy has much less influence on long-term rates, suggesting some
broader economic forces are at work.
Economists have identified two trends in particular that could explain why rates fell to unusually low
levels during the crisis. First, an increase in risk aversion caused a flight to safety-there was relatively
more demand  for safer assets such as Treasury securities, driving down those rates, and less demand for
riskier assets with higher rates. If a higher percentage of total credit is extended to lower-risk borrowers,
then average interest rates would be lower. Some have argued that new financial regulations after the

                                                                  Congressional Research Service
                                                                    https://crsreports.congress.gov
                                                                                        IN11074

CRS INSIGHT
Prepared for Members and
Committees of Congress

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