No one should overestimate economists' powers of understanding. Just as the magnitude of the global downturn that began in mid-2008 took most economists completely by surprise, so did the sclerotic nature of the recovery. Similarly, economic forecasts today appear to be nothing more than hopeful extrapolations of recent growth.

In reality, all is not well beneath the surface. Should another financial crisis materialize, the subsequent recession might be even costlier than the last one, not least because policymakers will face unprecedented economic and political constraints in responding to it.

Some take comfort in post-crisis improvements to global financial regulation, on the assumption that these measures will prevent financial distress from spilling over into the real economy. This is an ill-advised stance. The analytical foundations of many of these "improvements" appear shaky, and the challenges of implementing the new regulatory regime have proven formidable.