The Metropolitan Museum of Art in New York City is one of the best in the world. Under an 1893 law, it must admit the public free of charge five days and two evenings a week. The Met has a long practice of posting a sign at all times at the entrance that says $25 admission. In small letters, it says “recommended.” About half of the visitors pay that amount, many not knowing they do not have to pay. The Met says it needs the revenue. A class action suit was filed on behalf of those who paid (how the enterprising attorneys are supposed to track down visitors is unclear). Is it unethical for the nonprofit museum to imply that a price must be paid when it is really a donation?