What marketing programs can be devised to make a profit for a mobile application developer?

Question

Marketing

Developed a mobile application.
The essence of the application is a city guide with all the information for the city.
The main income is expected from shops, organizations, etc. due to the fact that:
- the store\organization can put its ads in the application
- the store can somehow increase its sales using marketing tools (coupons, promotional codes, etc.).
The question is just this - what can be offered to stores so that they are interested in using the application as a tool to increase sales?
What proven marketing programs/models/business processes exist?
How on fingers all this should work?
What do you recommend to read on this topic?
How can this kind of cooperation be established between the app developer and stores? Probably there should be a certain agreement, does anyone have an example of such an agreement, share it?
PS There is no question about the demand for the application, its promotion, competitors. We consider the situation that the application is used by 50% of the population of the city and there are no competitors.

Answer 1

Make an ad exchange within the application. Let them pay for a position in a category. The one who pays more wins, gets the best position in the search, etc. If someone pumps in a million, he will be in the first position. Naturally, after some time, the attachments should become obsolete and the client will return to his position. Plus banner classics, etc.