It seems a simple question -- what is money?-- but the answer is more complicated than you'd think. In 1891, America's greatest self-made man, steel tycoon Andrew Carnegie, took on the subject in this essay. Here, he explains: - the historical basis for money as a medium of exchange
- the difference between "money" and "currency"
- the trouble governments get into when they "make money"
- the problems that coming with backing...