trgovački

1. commercial; trade; merchant
   Posle škole se zaposlio u trgovačkoj mornarici. — After school he got a job in the merchant navy.
   Njegov otac je radio kao trgovački putnik. — His father worked as a travelling salesman.

Common collocations: trgovački putnik 'travelling salesman', trgovačka mornarica 'merchant navy', trgovačka škola 'vocational school specializing in retail and commerce'. A shopping mall is usually tržni centar in Serbian, not trgovački centar.