NO. Since the market varies by neighborhood , and house prices vary by location, condition, size, etc, different homes have different values, and a lender will take this variability into consideration in assessing an offer.

Hi TK,
Good question. Actually, no - there's no standard they're willing to lose by. That would be considered price fixing, or could be perceived that way, which is unlawful according to the anti-trust laws. The price is ALWAYS set by the market. If you're not yet working with a buyer's agent, I would suggest you agree to be represented by one. They'll have the most knowledge and the best negotiating skills to get you the property at the lowest price possible.
Good luck!
--Tim