Part of Privateer and Privateer 2 was the ability of the player to go to Commodity Exchanges at various planets and bases in order to buy and sell items such as foodstuffs, minerals and contraband. The trade of commodities was a fairly important part of revenue building in the original Privateer...
wcrpg.fandom.com
The Privateer I commodities are listed in the tables there. I'm trying to remember which sources I used for that data; the official guide was one of them but I want to say it wasn't the only one.