BRUSSELS – Greece’s ballooning public debt is again throwing Europe’s financial markets into turmoil. But why should a debt default by the government of a small, peripheral economy – one which accounts for less than 3% of eurozone GDP – be so significant?
The answer is simple: the financial system’s entire regulatory framework was built on the assumption that government debt is risk-free. Any sovereign default in Europe would shatter this cornerstone of financial regulation, and thus would have profound consequences.
This is particularly visible in the banking sector. Internationally agreed rules stipulate that banks must create capital reserves commensurate to the risks that they take when they invest depositors’ savings. But when banks lend to their own government, or hold its bonds, they are not required to create any additional reserves, because it is assumed that government debt is risk-free. After all, a government can always pay in its own currency.
This assumption makes sense, however, only when a government issues debt in its own currency; only then can it order its central bank to print enough money to pay its creditors. Before the introduction of the euro, this was the case in all advanced countries.