Mary buys her child a toy every time he acts up in the store because she thinks it will make him behave better. sadly though she is using for a(n) behavior.

positive reinforcement; negative

Explanation:

Negative behavior is a type of behavior that is deemed as 'undesirable' by most people in society.

Positive reinforcement is a reward that we use to influence other people everytime they do a desired behavior.

In that particular case above, Mary hope that buying a toy for her (positive reinforcement) will stop her child from doing her negative behavior (acting up in the store).

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