Elite is the best strategy/trading game ever maded for pc.
Maded in CGA mode will let you to trade in universe full of different aliens and materials to trade.
You begin with a trading ship, with some money for fuel and to buy a little amount of material, from beginning planet (Lave)
You must choose tha planet tha let you to take the best prices and sell to planet that let you to gain more money.
There are some different planets :Agricultural, Industrial, and so on…Beware from the pirates and evil planets, until you have the best equipment
. This game currently is freeware .Download Elite