Less than 1% of the world's billionaires donate to housing and shelter charities.

Philanthropy is billionaires' favorite pastime, but the world's richest people don't support all causes equally, according to Wealth-X's 2019 Billionaire Census. The causes they choose are influenced by a variety of factors. American billionaires traditionally fund new buildings or departments at their alma maters, Wealth-X reported, while some billionaires prefer…