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
Cargo Prices Production Cost
Buy Sell
Alcohol 60 40 28-31
Bricks 33 22 1.7
Cannon 375 250 112
Cattle 7 5 2.2
Cloth 37 25 11-22
Clothes 150 100 16-27
Cocoa 37 25 25
Flour 7 5 5.1
Food 19 13 2.5-11.9
Gold 525 350 80
Grain 3 2 1.7
Iron 97 65 58
Jewellery 675 450 76
Muskets 187 125 98
Ore 67 45 43
Spices 45 30 25
Sugarcane 22 15 10.9
Swords 135 90 85
Tobacco 26 17 18.4
Tobacco products 75 50 47
Tools 105 70 45
Wood 22 15 1.8
Wool 18 12 2.6-8.1