John Adams was from 1789 to 1797
<span>Quackery is the promotion of fraudulent or ignorant medical practices. A quack is a "fraudulent or ignorant pretender to medical skill" or "a person who pretends, professionally or publicly, to have skill, knowledge, or qualifications he or she does not possess; a charlatan or snake oil salesman".</span>
<span>It happens when one business can provide a product at a cheaper cost than two or more businesses can. </span>