Information Asymmetry is the more generic term for this situation. One person has the info, and the other doesn't -- and can benefit from keeping it that way,

Information Asymmetry is the more generic term for this situation. One person has the info, and the other doesn't -- and can benefit from keeping it that way, e.g. insider stock trading, estate sales, even garage sales where you know what their old junk is really worth. https://en.wikipedia.org/wiki/Information_asymmetry https://en.wikipedia.org/wiki/Information_asymmetry