The reason why it's reduced is because people who are educated are more capable of doing various business-money things like: earning more money, conceiving new business plans, making decisions towards employment . . . and so forth.
Thus - some are then able to get theirselves out of 'poverty' - or help others out of poverty.
But it doesn't have anything to do *with* their economic *system* - it has to do with the fact that they are plugged into the system rather than being excluded from it - meaning, they have money to spend. Might not be a lot - but it's some.