Cost per inquiry (CPI)- noun
The financial cost of getting one person to inquire (ask) about your product or service. This term is used in direct response advertising.
The advertisment cost us $1000. As a result, we had 200 calls from customers, so CPI was $5.

Direct mail -noun
Marketing leaflets or letters sent directly to customers or potential customers via the postal service.
We used direct mail to inform our customers about our new special offer.
We sent it by direct mail.

Macromarketing- noun
When a company adapts itself (changes the product, price, image, etc.) because of changes in the market and in the industry.