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Do the 26 richest billionaires own as much wealth as the poorest 3.8 billion people?

Bernie Sanders, who is running for president in 2020 gave a speech a few days ago. He makes a claim which goes like the following:

Today the world's richest 26 billionaires, 26, now own as much wealth as the poorest 3.8 billion people on the planet, half of the world's population.
Link to video

This is a surprising figure, at least to me (though maybe it shouldn't be.) I'm just wondering if it's true.