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Szu Ping Chan takes an in-depth look at how we measure economic growth and asks if it can be improved. Oxford economics professor Diane Coyle argues that GDP is only a partial measure of what happens in an economy. Erik Brynjolfsson of the Massachusetts Institute of Technology makes the case for estimating the value of free internet services in economic activity statistics. And Peter Levell of the Institute for Fiscal Studies tells us falling response rates for those conducting economic surveys could be affecting the validity of the data that emerges as a result.