Since the election, American public policy debate has been focused on prospective budget deficits and what can be done to reduce them. The concerns are in part economic, with a recognition that debts cannot be allowed, indefinitely, to grow faster than incomes and the capacity repay. And they have a heavy moral dimension with regard to this generation not unduly burdening our children. There is also an international and security dimension: The excessive buildup of debt would leave the United States vulnerable to foreign creditors and without the flexibility to respond to international emergencies. While economic forecasts are uncertain, the great likelihood is that debts will rise relative to incomes in an unsustainable way over the next 15 years without further actions beyond those undertaken in the 2011 budget deal and the end of year agreement that averted a fall over the “fiscal cliff.” So even without the risk of self-inflicted catastrophes — like the possible failure to meet debt obligations or the shutting down of government — it is entirely appropriate for policy to focus on reducing prospective deficits.
Summers, Lawrence H. "America has Multiple Deficits." Reuters, January 22, 2013.