Answer:
Up-Selling
Explanation:
Up-selling refers to a trick that sellers often use to influence influence costumers to buy more expansive items by offering additional 'bonus' or 'add-nos' to the offer. This additional add-ons are designed to make the purchase seems to have higher value in the perspective of the customers.
We can see this trick From the example above. The sales representatives from best buy use 'Best picture quality' as the add-ons to influence the customers to buy the more expensive type of TV.