Although much of the equipment used by dentists is thrown away after one use, many of the instruments used to clean teeth, fill cavities, and deal with impactions and other dental problems are made of steel and must be sterilized. A dentist is considering replacing his conventional steam sterilizer with a chemical sterilizer that cleans without rusting or corroding instruments. Because the dentist is already familiar with sterilizers, he is looking to find the best price possible on a chemical sterilizer. He is engaged in a .

He is engaged in a  Modified rebuy.

Explanation:

In the field of business, a modified rebuy can be described as a situation in which a person or an organization buys products with modifications in it. The buyer can either change the supplier or certain other elements of the products which they previously took.

The same phenomenon can be seen in the question. The dentists is modifying his products and may as well modify the supplier from which he buys the product depending on the price.

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