Why don't the world's 42 billionaires donate their income to charity every other year?

Why don't the world's 42 billionaires donate their income to charity every other year?
- Now, this is not that surprising – there are constantly stories in the news about economic inequality. But let's really ... Oxfam reports that the wealth of billionaires has increased 13% a year on average for the period between 2006 and 2015, and that last year, billionaires gained 

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