Question: What is the purpose of a warranty given by a used-car dealer? Evaluate one used-car warranty that gives your money back if not satisfied in a certain time period, and one that does not give you back your money but lets you put this money toward the purchase of another used car. Which warranty would you prefer? 9. Farm price supports (price floors) have been a part of the economic landscape for the better part of a century as farming has evolved from a way of life to today where most agricultural products are produced on large corporate farms. Stable farm prices are the benefit of these policies. What are the costs?