There are plenty of profits to be made – actual taxes on capital are not too high, and cheap finance is available to the corporate sector. But the concentration of income at the top – more than 90% of the gains from US economic growth in 2011, for example, went to the top 1% – is constraining broad-based recovery and leaving macroeconomic policy caught between the need for continued “stimulus” and the dangers of growing public debt and asset bubbles inflated by record-low interest rates.