About four hundred years ago, the Dutch merchant Pieter Schage purchased the island of Manhattan from the native North Americans for 60 guilders, which is about $1000 in today's money (actually, Pieter made the purchase in 1626, but let's call it 400 years for the sake of round numbers)1. If the natives had re-invested the money and achieved the 5% real rate of return that many economists think is typical for western countries over the past several centuries2, how much money would they have today?