On the usefulness of Public Debt for Growth

Public debt is always the source of deep and intense discussions. It’s often the case in France but it’s currently also the case in the USA with republicans’ candidates. Usually, public debt concentrates all the uncertainties and concerns about the future. A too rapid increase of the public debt is often perceived as a persistent deterioration of the future.
Happily this is not that simple

First, public debt in the United Kingdom has been high for numerous years, decades and centuries. It has not prevented UK supremacy on economic and political fields.


Source Paul Krugman NY Times

Public debt has to be high in order to facilitate wealth transfer through time, from now to the future. It’s the least risky asset. When Alan Greenspan was Fed’s president there was a real question on this issue.  There were discussions on what would happen if public debt had converged to 0. What would have been the support for wealth transfer between today and tomorrow without taking risks?
It’s not a theoretical question because most of life insurance contracts use public debt as their main asset. How would life insurance behave without public debt?

Public debt is also a way to smooth shocks through time. The graph above shows that increases in public debt has usually been associated with wars (Napoleonic wars, WWI and WWII). It was easier to postpone their financing with debt.
In other periods, in can help transferring an excess of private debt on the government. This latter will be able to amortize it in the long and very long-term and at the same time it will reduce constraints on the private sector.
That’s was the US strategy from 2009 on. The private debt (households and companies) has been reduced and at the same time public debt has increased rapidly. Growth drivers are in the private sector and by this transfer there is a reduction of private sector’s constraints.
Probably, the private debt reduction has not been enough to create a strong US recovery.
usa-2015-q1-debtThe last point that is usually mentioned is related to the service of the debt. Interest paid are often perceived as too high, too persistent and a source of deterioration of the economy for our grand children.
Just on remark to start: who will receive in the future the interest paid on life insurance contracts? Our grand children. So that’s not an issue
And are interests paid so important?
In France, the amount is back to 1989 level. Lower interest rates have had a strong impact; interests are close to 2% of GDP, 1 point lower than in 1995.
Interest rates will remain low for an extended period and it’s time to take advantage of that. It’s time to invest and to support public investment in order to create an impulse that will allow the economy to jump on a higher trajectory. This will create strong incentives for the private sector to invest. At the end it will help to reduce the debt to GDP ratio by increasing GDP.
Doing nothing and trying to reduce the public debt rapidly as it has been done in the Euro Area after 2011 has been a catastrophe.
france-2015-InteretondebtThis situation is not specific to France  The USA, UK and Spain in my sample have interests paid higher than in France. But their GDP growth was higher than in France in 2014. On the other side, interest paid in Japan are low but with a weak growth, the weakest of the sample in 2014.
The relationship between interests paid and growth is not as simple as some expect it to be.

1 thought on “On the usefulness of Public Debt for Growth

  1. Pingback: The graph that worries me a lot: An Update | Philippe Waechter's blog

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s