As the International Monetary Fund warned yesterday, America's economy shows worrying signs of weakness. Worse, and in common with other developed countries, it also lacks a credible strategy for longer-term growth. Without such a strategy, a strong global recovery is unlikely.

The structural evolution of the US economy over the past 15 years has been driven by excess consumption, enabled by debt-fuelled asset inflation. The crisis put a stop to this, but structural deficiencies remain. America's export sector is too small and underdeveloped. The financial sector became outsized, and is down-sizing.

A pattern of underinvestment in infrastructure has left the economy less competitive than it should be. Energy pricing issues have been ignored, causing underinvestment in urban infrastructure and transport. The education system has widespread problems with efficiency and effectiveness. Elsewhere, state budgets are in distress as a result of insufficiently conservative budget policies.