The Federal Trade Commission agency is responsible for the cheating. As they are responsible for the check and balance of advertisement, they're running.
As Tim was not given his first deal during the time of the deal the dealer asked for a lower price but after the interest developed the Tim dealer increased the price of the car. In economics, the term is used as opportunity cost. There after developing the interest of the buyer dealer seeks the opportunity cost of the car and demanded the higher price of the same product due to the shortage of that product and the interest of the respective buyer.
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