Trading

Trading will be a part of the dynamic economy in Escape from Tarkov, including rag fairs, auctions, and even the possibility to become a trader.

Dealers

 * The pillars of commerce in the ruined, beleaguered Norvinsk. Each dealer specializes in a particular category of goods, be they military gear, weapons, or meds. While their prices are typically steep, you get what you pay for - and more importantly, you can build reputation with each dealer through Quests, to reduce the commission they receive (additional markup you pay on sales and purchases), receive better offers in general, and so on.
 * Dealers also offer additional services, such as repairs and insurance (allowing you to recover your gear in case of death during a raid).

Flea markets and auctions

 * It is not clear what form either of these options will take - and what the difference between them is supposed to be.