"In India, the net worth of the billionaire community increased twelve-fold in 15 years, enough to eliminate absolute poverty in this country twice over," said Lagarde delivering the Richard Dimbleby Lecture in London, according to the copy of the speech made available by the IMF.
"We are all keenly aware that income inequality has been rising in most countries.
"Seven out of ten people in the world today live in countries where inequality has increased over the past three decades," she said adding that the richest 85 people in the world own the same amount of wealth as the bottom half of the world's population.
"They have focused on economic growth, on the size of the pie rather than its distribution.
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"Put simply, a severely skewed income distribution harms the pace and sustainability of growth over the longer term.
"It leads to an economy of exclusion, and a wasteland of discarded potential," Lagarde said.
By 2020, for the first time ever, there will be more old people over 65 than children under five, she added.