After a couple orally agrees to purchase an appliance at a special price, the salesman tells them he misquoted the price, indicating it was only available for an out-of-stock model with fewer options. The couple then agrees to purchase the appliance at a higher price. It appears that the salesman has effectively used the technique.

low-ball technique

Explanation:

Low-ball technique is a method used to persuade buyers make a purchase by offering a product at low price to get the customer to commit. The price is then increased.

This is a method commonly used by sales people.

In the given scenario this was used by the salesman when a couple orally agrees to purchase an appliance at a special price, he tells them he misquoted the price, indicating it was only available for an out-of-stock model with fewer options.

Since the couple had made a commitment to buy the particular appliance, they still buy at the higher price.