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The Independent Adviser for Vanguard Investors
•
August 2015
•
13
FOR CUSTOMER SERVICE, PLEASE CALL
800-211-7641
fund), you are really picking between
price stability and income stability.
As a side note, every year in the
annual
Independent Guide to Vanguard
Funds
, you can find the two components
of a bond fund’s total return—its income
return and its capital return—in the
Details table on each fund’s profile page.
Safety orYield
But investing in bonds and bond
funds isn’t all interest rates and maturi-
ties. Not only do you need to decide how
long you want to lend money for, but
you also need to decide who you want to
lend that money to. Many different types
of entities need to borrow money, and
not every one of them is equally likely to
be able to meet their obligations to both
continue paying their promised inter-
est and pay you back your principal. In
bond lingo, the risk that the bond issuer
may be unable to pay back the money it
borrowed is called either
credit risk
or
default risk
.
Bonds issued by the U.S. Treasury
are often referred to as “risk-free”
because investors see the U.S. govern-
ment’s default risk as minimal to non-
existent. The government can always
raise taxes or print money to cover its
obligations. Of course, Treasury securi-
ties are still subject to interest-rate risk,
so they really aren’t risk-free unless
you hold them to maturity.
Bonds issued by corporations gener-
ally carry a higher risk of default. When
lending to an entity with greater default
risk, lenders (the folks like us who are
buying the bonds) want to be compen-
sated for this risk, usually in the form of
a higher yield.
If you are buying a bond fund,
default is generally not a concern, as the
funds are diversified to the point that
one company defaulting won’t derail
overall performance—this is especially
true at Vanguard, where funds often
hold more than one thousand indi-
vidual bonds. However, even ignoring
default risk, there are still trade-offs
to consider when deciding between
the safety of Treasury bonds and the
higher yield of a corporate bond-ori-
ented fund, like
Intermediate-Term
Investment-Grade
.
Bonds issued by companies with
greater credit or default risk tend to be
more sensitive to the economy than to
changes in interest rates. Why is that?
As a rising tide tends to lift all ships,
a growing economy makes it easier for
even less financially stable companies
to pay back their debts. But a faltering
economy can be enough to derail those
same companies and damage their abil-
ity to make bond payments. (This is
particularly true when we start talking
about high-yield bonds, or junk bonds,
which are rated below investment grade
and are the most likely to default.)
While corporate bonds are less sensi-
tive to changes in interest rates, being
tied to the economy means that they
are more apt to be buffeted by the same
factors that move stocks than Treasury
bonds are. Consider the charts above
showing the average returns of
Inter-
mediate-Term Treasury
, Intermediate-
Term Investment-Grade and
High-Yield
Corporate
in different environments.
The first chart shows the aver-
age return of each bond fund during
months when
500 Index
was either
positive or negative over the past 15
years. In months when 500 Index fell,
Intermediate-Term Treasury on average
gained 1.0%, which put it ahead of its
corporate-bond heavy siblings. High-
Yield Corporate actually lost 0.9% on
average in months when stocks were in
the red. Conversely, when stocks rose,
the corporate bond funds outpaced the
Treasury fund.
The second chart shows the average
returns for the three bond funds inmonths
when the yield on Intermediate-Term
Treasury rose or fell. All three funds did
better on average when yields were fall-
ing—no surprise there. Treasurys were
the most sensitive to changes in inter-
est rates, performing best when yields
fell and dropping when yields rose.
Compare that to High-Yield Corporate,
which delivered positive returns on aver-
age when rates were rising. This is partly
due to the higher yield of the junk bond
fund helping to offset the impact of fall-
ing prices, but keep in mind that rates
tend to rise when the economy is doing
well—a good environment for more
risky corporate issuers.
In sum, the charts describe the trade-
off between Treasury and corporate
bonds: Treasurys offer more down-
side protection when stocks fall, but
carry more interest-rate risk. Corporate
bonds don’t offer as much of a buffer
when stocks are falling, but are less
sensitive to swings in interest rates.
For my money, Intermediate-Term
Investment-Grade—with a portfolio
that is predominately invested in high-
quality investment grade-rated corpo-
rate bonds—has balanced the trade-offs
between interest rate and credit risk
well, and with its higher yield, should
continue to outperform Intermediate-
Term Treasury over the long run.
Inflation Risk
Another risk, hidden yet insidious,
is
inflation risk
, or the risk that a
bond’s return may not keep up with
inflation. As you know, inflation is a
broad increase in the prices of goods
and services. One outcome of inflation
is that your purchasing power decreas-
Protection From Falling
Stock Prices…
Int.-Term Treasury
Int.-Term Invest.-Gr.
High-Yield Corporate
-1.25%
-1.00%
-0.75%
-0.50%
-0.25%
0.00%
0.25%
0.50%
0.75%
1.00%
1.25%
1.50%
1.75%
Avg. Monthly Return When
500 Index is Down
Avg. Monthly Return When
500 Index is Up
…Versus Sensitivity
to Rates
Int.-Term Treasury
Int.-Term Invest.-Gr.
High-Yield Corporate
-0.75%
-0.50%
-0.25%
0.00%
0.25%
0.50%
0.75%
1.00%
1.25%
1.50%
1.75%
2.00%
Avg. Monthly Return When
Yields Fall
Avg. Monthly Return When
Yields Rise