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Which concept do businesses use to earn income?

Revenue Model

Explanation:

This model best describes which revenue source the business must consider to increase or retain its income, what the customers must be offered, what should be the product's price and who are our potential customers. So revenue model is very helpful as it also tells how attract the customers to buy its products (Marketing), what new feature must be included in the product to grow the market, etc.

2+2 is 4-1 is 3, quick maffs XD

Explanation: