We had one Marxist history teacher who taught a straight...

We had one Marxist history teacher who taught a straight Marxist view of history, ... I remember he once asked where diamonds got their value. Someone said, 'because they're beautiful'. He said, 'no, no'. Someone else said, 'supply and demand'. He said, 'no'. Someone else said, 'from the sweat of the workers in the mines!' And he said 'right!'