Nearly two weeks after Moody’s downgraded the UK’s credit
rating, markets still seem to be taking the news in stride: The FTSE All-Share
Index is up, and 10-year gilt yields were back below 2% on Tuesday (per Bloomberg).
Why don’t markets much care about the downgrade?
Well, for one, Moody’s and the other ratings agencies (Fitch
and Standard & Poor’s) don’t have a great track record for accurate,
forward-looking forecasts of credit risk. Instead, their opinions often seem
based on backward-looking information or political, rather than economic,
factors. For example, S&P downgraded the US due to heated political debate
over the US’s arbitrary debt limit—which has no bearing on the US’s solvency.
True to form, Moody’s decision cited the UK’s likely delay
in reaching some deficit targets—it’s self-imposed, politically driven,
economically arbitrary deficit targets. But a one-year delay in reaching
austerity targets doesn’t really alter the UK’s credit risk—the deficit’s still
expected to fall over the next few years. Credit markets care more about
overall progress than whether the deficit is 1.2% of GDP in 2017 (as projected
in 2011) or 2.6% (latest projection). Granted, the delay’s not ideal—an extra
year of deficit reduction won’t be easy on those people impacted by tax hikes,
public sector job cuts and real (i.e., inflation-adjusted) cuts to pension
benefits, but this is ancillary from the UK’s credit risk. Markets understand
this.
Markets also understand the UK is, in fact, one of the most
stable, solvent nations on the planet, and its default risk is exceedingly low.
We can see this in three charts.
First, Exhibit 1 shows net public debt (total debt excluding
intra-governmental holdings, which effectively cancel) as a percentage of GDP.
Exhibit 1: Net Public
Debt as a Percentage of GDP, 1692 – 2012 (Estimated)

Source: HM Treasury,
as of 02/21/2013. Includes official 2012 estimate. All others are actual outturn.
Though net debt has increased relative to the size of the
economy in recent years, it still remains well under points seen during much of
the past three centuries.
And this debt is plenty affordable. Exhibit 2 shows UK
interest costs as a percentage of GDP.
Exhibit 2: Debt
Interest Costs as a Percentage of GDP, 1946 – 2012

Source: Office for
National Statistics, as of 02/27/2013.
The ratio has increased since 2008, but it remains near 20th-century
cyclical lows. In fact, interest payments were much higher during the 1990s,
which featured robust economic gains.
Interest costs as a percentage of tax revenue, shown in
Exhibit 5, tell a similar story.
Exhibit 5: Debt
Interest Costs as a Percentage of Tax Revenue, 1946 – 2012

Source: Office for National
Statistics, as of 02/27/2013.
Here, too, UK debt appears very affordable by historical
standards. And, as even Moody’s admitted, debt service can likely withstand
even higher yields. According to Treasury forecasts, if 10-year gilt yields
were to rise to 5% and stay there for years—a seemingly unlikely scenario given
the UK’s fiscal strength and cumulative deficit reduction progress—the ratio of
interest costs to expected tax revenue would rise just north of 10% of GDP over
the next three years. That’s still plenty manageable.
Simply put, with very affordable debt and some of the
world’s deepest, most liquid and most stable credit markets, the UK doesn’t
appear to have heightened credit risk.