Answer:
Cross-promotion
Explanation:
Cross-promotion occurred when the brands team up their customers with each other. For example, Disney has to allow its feature on Kellogg raper. When cross-promotion occurs between the product of a company that is called in-group cross-promotion.
But when cross-promotion occur between two company product is called out group promotion. In cost production, it is an effective strategy that is used by companies for cross-promotion. In the context purchase marshmallow is an example of cross-promotion.