What goes in the blank?
Commerce → Commercial
Finance → Financial
Trade → __________
What goes in the blank?
Commerce → Commercial
Finance → Financial
Trade → __________
Trade is also an adjective; ( from TFD)
of or relating to trade or commerce.
(Commerce) intended for or available only to people in industry or business: trade prices.
Trade -> Trading
trading company, trading post, insider trading, trading partner, trading port, trading account
The adjective of trade can be also trade, e.g., trade secret, trade agreement, trade protocol, etc. If "commercial" is used in the same adjectival sense, it is ok.
Transactional
Hope this helps :)