Usage patterns
商業に従事するto be engaged in commerce/trade
His family has long been engaged in commerce.
商業が発展するfor commerce/trade to develop or flourish
Commerce has developed in this port town.
商業的な〈物〉commercial (film, success, etc.)
That film achieved commercial success.
商業を営むto run/carry on a commercial business
He has run a commercial business in this town for many years.