Dr Jon Mulberg on why GDP isn’t the best gauge of economic healthThe use of alternative metrics to GDP has a long history within the environmental movement (Housework to green energy: the new markers of growth in rival metric to GDP, 19 November).GDP was never meant to be a measure of national or even of economic wellbeing. It simply measures sales, and is always the same figure as national expenditure. The person who invented the measure – Simon Kuznets – called it national income, which it also mirrors. Continue reading...