Tim Bond, head of asset allocation at Barclays, says this in the Financial Times:

Similarly, few commentators consider the possibility that the large post-Lehman rise in US unemployment was a mistake on the part of panicky managements. Yet this is precisely what trends in labour productivity growth, not to mention common sense, tell us occurred.

In the first half of 2008, labour productivity growth averaged 3.3 per cent, while the unemployment rate rose to 5.6 per cent. At that point, there was no evidence US companies were overstaffed. Thereafter, output collapsed, yet business productivity growth remained positive, registering an average yearly pace of over 2 per cent, as companies shed labour at a faster pace than they reduced output. Businesses, like markets, panicked after Lehman went under. Employment and output were both reduced far more than it turned out to be necessary, as businesses temporarily and understandably assumed a worst case scenario.