I would like to add that, even though its patent has expired, a medicine can still be sold, not as a copy but in its original form. In some cases, doctors continue to prescribe the original medication because its beneficial effects and its side effects are not exactly the same as the copy. Everyone reacts differently to a medication. So there is always some kind of a market. Under those conditions, companies often prefer not to put a generic version on the market, for reasons that Mr. Livingston has explained.
