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It seems the world has got a whole lot greedier. Back In 1956 Frank Sinatra asked Who Wants to be a Millionaire? This year Travis McCoy and Bruno Mars sang about how they wanna be a billionaire. That's a thousandfold increase in aspiration during a period retail prices have risen by a factor of just eight. We stop eating when we're full so why don't we stop wanting more money? Justin Rowlatt and his guests, Chrystia Freeland, Charles Abugre and Jamie Whyte discuss whether the very rich benefit the rest of us, and if they do, whether they ever do it voluntarily. And Colm O'Regan muses on whether he really does want to be a billionaire.

(Image: Yachts moored at Port Hercules in Monaco. Credit: VALERY HACHE/AFP/GettyImages)