Jack Stewart heads to Los Angeles, home to many of America's rich and famous, to explore what impact wealth has on our moral behaviour. Hollywood often has plenty to say about the corrupting influence of money, but can science tell us even more.Professor Paul Piff of the University of California explains his research, which finds that the richer a person becomes the more selfish, narcissistic and less generous they tend to be. However, not everyone is convinced that the American dream is a recipe for immoral behaviour, with opinions expressed by some rather unusual contributors – straight from the Hollywood Walk of Fame.(Photo: Jack Stewart talking to Spiderman, BBC copyright)

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