It was built to count tanks: Kamath as he questions GDP's use to measure economy

Billionaire Nithin Kamath questioned using GDP to measure the growth of economies, as one of history's biggest economic shifts is underway. "GDP tells you real things about production and employment. But it was built in 1940s to count tanks...and that's still the gauge we're using," Kamath said. He noted how clearing forests and rising cancer cases can also raise GDP.