The recession has been a wake-up call for the well-to-do, many of whom came to realize that great responsibility should accompany great wealth, according to research by PNC Financial Services Group Inc.

A rising number of high-net-worth people, including Warren Buffett and Bill Gates, seem to be taking the Andrew Carnegie view: that there is only so much money that one family needs and that bequeathing huge sums to the next generation can be dangerous.

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