Saduko Games

I played The Caravaneer and Frontier online, and I really liked how you can make a profit and sell them to different towns or cities, and fight people, but I was just wondering what those types of games were called, and what other types of games like that were online?

Can anyone please tell me? Thanks.

Most MMORPGs have some sort of player-based economy via an auction house or player shops.

You could try Face of Mankind if you want something totally player based.