When a vacuum cleaner salesman persuades people to let him vacuum their living room for free, he is likely to increase his chances that he will make a sale. The salesman is using the:

Question

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The foot-in-the-door technique involves making a small request or offering a small favor before making the larger request or trying to make a sale. By offering a free demonstration of his product, the vacuum cleaner salesman is using this technique to increase the likelihood that the person will buy the product.

When a Vacuum Cleaner Salesman Persuades People to Let Him