With fiscal policy generally constrained by the need to restore confidence in the sustainability of public debt and the effectiveness of monetary policy to stimulate growth is reaching its limits, the question arises: what can advanced economy policymakers do to restore economic growth and stimulate investment?   A powerful instrument to restore growth is clear and credible policy to encourage investment in welfare-enhancing activities that need public support to be commercially viable. The low-carbon and wider 'green' sector is an exemplar for this.

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