Earth-Mars Trade
Earth-Mars trade will likely be the primary form of commerce for the first Martian settlements. This trade is limited by the great distance between Earth and Mars, and the enormous cost of lifting goods out of the gravity well of the two planets. The majority of the commerce will necessarily be information-based. Gosh that's a bizarre tuohght! I'd have no idea what I'd do/think if that were possible, and to a point I tend to agree with what Lauren said, about whether or not we'd be able to look after another planet if we can't even look after the one we live on currently!