Sandel introduces the principles of utilitarian philosopher , jeremy bentham , with a famous 19th century law case involving a shipwrecked crew of four .
Knivet , who stayed on board , escaped only to be shipwrecked again , and to begin his diet of crab and whale meat in solitary confinement on the beach .
T he excel centre , a windswept complex deep in london 's docklands , is best known as the venue for an annual boat show . On thursday it is instead the destination for a flotilla of limousines as us president barack obama and other leaders assemble in an effort to rescue a shipwrecked world economy .
