From grumpy old misers to the wolves of Wall Street, Hollywood has always had plenty to say about the corrupting influence of wealth. But how accurate are the silver screen stereotypes - does money make you mean?The road along the seafront in Los Angeles is lined with palm trees - skateboarders and dog-walkers stroll along, heading for the beach. And social psychologist Prof Paul Piff is spending the afternoon going back and forth over a pedestrian crossing.








