Another useful table by Charlie ( http://www.anno-zone.de/Charlie/index.html ), again included here for the benefit of non-German speakers. This shows the prices at which AI players (except Free Traders) will buy and sell goods. Charlie also includes production prices, shown in the Production Efficiency appendix.

AI Trade Prices and production Cost
CargoPricesProduction Cost
BuySell
Alcohol604028-31
Bricks33221.7
Cannon375250112
Cattle752.2
Cloth372511-22
Clothes15010016-27
Cocoa372525
Flour755.1
Food19132.5-11.9
Gold52535080
Grain321.7
Iron976558
Jewellery67545076
Muskets18712598
Ore674543
Spices453025
Sugarcane221510.9
Swords1359085
Tobacco261718.4
Tobacco products755047
Tools1057045
Wood22151.8
Wool18122.6-8.1