The used bike market as a whole factors in lemons. This is why the bid/ask spread in used markets such as bikes is quite high. (Because of the risk you may get

The used bike market as a whole factors in lemons. This is why the bid/ask spread in used markets such as bikes is quite high. (Because of the risk you may get a lemon.) I am not sure how this is different from most other used markets. Or if he is using the term lemon in the sense we are expecting for that matter.