Wealthiest Donors Gave 9 Percent of Their Income in 2007, Study Finds

Among the survey’s other findings:nDonors said they cared more about whether charities demonstrated sound business practices and spent an appropriate amount on administrative costs than they did other concerns.

* People who made their money from a family-owned business or a start-up company tended to give far more, on average, than those who derived their money from other sources.