Here, companies create the value
Available in the game

A mining company supplies ore. A refiner turns it into material. A manufacturer assembles components. A trader arranges the sales. These roles meet on shared markets, where another company can fill your order.
Every station has its own market
A price lives in the orders of a specific port, and goods physically sit in a specific place. The price difference between ports is the trading opportunity.
Demand is finite
The best price applies only to the order's volume. A large lot may sell cheaper or not sell at all. An order at another port is not reserved for the duration of the flight: another ship may take it.
The server computes profit
Before a trade you see an estimate. After the trade, the server records cash and cost basis. We never mix those numbers.