According to a United Nations report called “State of the future”, in 2007 25% of the world’s population were living on less than $1 a day.
(Thankfully this is down from 1980 when 40% of the population were doing so, but I’m afraid that that is probably more to do with inflation than philanthropy. My premise is that if you can’t pay a living wage to someone, do the work yourself. Anything else is slavery.)