During the age, manufacturers were principally concerned with production, and the primary burden of marketing fell on the wholesalers.

industrialization age

Explanation:

Industrialization age -

It refers to the time period which encircles , the alterations in the social and economic organization.

This very time period begins around 1760 , firstly in the Great Britain and then to other countries .

During this age ,

The main concern  of the manufacturer's is the production and therefore, the burden of the marketing goes to the wholesale people .

Hence , from the question,

The correct term is industrialization age .

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answer(d) encourage cooperation by improving the chances of mutually agreeable transactions;