What if the US unemployment rate rises above 10 per cent and stays there for an extended period? This is a question that is not being asked enough, even though it entails yet another historical anomaly that will further complicate policy formulation and open it up to greater political interference.

The unemployment rate is traditionally characterised as a lagging indicator and, as such, is viewed as having limited predictive power. After all, unemployment is a reflection of decisions taken earlier in the cycle so the rate always lags behind the realities on the ground – or so says conventional wisdom.