Winfrey: So how has being the first billionaire author affected your perception of yourself?

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Rowling: I dress better. But that’s not just about money, ’cause you meet lots of rich people who dress atrociously. It’s more that you can afford to – well, you can definitely afford better clothes. I think the single biggest thing that money gave me – and obviously I came from a place where I was a single mother and it really was hand to mouth at one point. It was literally as poor as you can get in Britain without being homeless at one point. If you’ve ever been there you will never, ever take for granted that you don’t need to worry. Never.

Source : http://www.harrypotterspage.com/2010/10/03/transcript-of-oprah-interview-with-j-k-rowling/