The major division of commerce are "trade" and "auxiliaries to trade".
"Trade" refers to the exchange of goods and services between buyers and sellers. It involves activities such as buying, selling, and exchanging of goods and services.
"Auxiliaries to trade" refers to activities that support or facilitate trade, such as transportation, communication, warehousing, banking, insurance, advertising, and marketing. These activities help to make trade more efficient, safe, and effective.
Therefore, the major division of commerce includes both the actual exchange of goods and services (trade) and the supporting activities that make trade possible (auxiliaries to trade).