When McDonald's introduced its $1 $2 $3 menu in 2020 and competitors responded by putting popular items on their value meal menus to keep up, this was an example of a(n) that results when several competitors use promotions simultaneously.

Sales promotion trap, is the right answer.

Explanation:

The given case or situation in the question shows the example of “sales promotion trap” because the sales promotion trap occurs when a firm promotes its commodity by using different promotional strategies the other firm in the same industry copy the strategy and start competing the company. Thus, this is known as a sales promotion trap.

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