Economics is a social science, that is concerned with meeting 'unlimited demands with only scarce resources'. Economics relies on the assumption that everyone wants more and more money, goods and services = we are all a bunch of greedy mo' fo's. Hence the concept is accurate, and will continue to be taught in colleges everwhere for years to come. Noteable masters include the venerable Daddy G, of Peterborough fame.
A: how much are these bananas?
A: Fine, I buy them off that illegal immigrant for £1.50
Hence the laws of Supply and Demand are and the concept of economics is satisfied.