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To some Goldman Sachs is a model business: hugely profitable with incredible reach and influence throughout the world. It has been called the king of investment banks, controlling assets of a trillion dollars.

But to others Goldman Sachs exemplifies the worst of capitalism. One journalist called it "a great vampire squid wrapped around the face of humanity, relentlessly jamming its blood funnel into anything that smells like money." It is a description that has haunted the company.

On Business Daily we ask Lloyd Blankfein, the chairman and chief executive of Goldman Sachs, about the secrets of his bank's success and whether the world's highest paid banker worries about inequality.

And if you want to get on in business who provides the best role model? We speak to the psychologist who claims that there is a lot we could all learn from psychopaths.