Let the buyer beware.
The best rule to keep in mind when buying anything from a pushcart is: "Caveat emptor."
"Without a warranty, the buyer must take the risk" is the basic meaning of the phrase caveat emptor. In olden days when buying and selling was carried on in the local marketplace, the rule was a practical one. Buyer and seller knew each other and were on equal footing. The nature of modern commerce and technology placed the buyer at a disadvantage, however, so a stack of regulations have been written by federal, state, and local agencies to protect the consumer against dangerous, defective, and ineffective products, fraudulent practices, and the like.