Can someone please explain to me what the Thompson Rule is? 

Google is your friend....

Never heard of it, tell us what it is, we’ll tell you if we think it makes any sense. 

@Wayne Brooks I was trying to provide value to another agent who was told they may need to know it on their deal. I was hoping someone could just summarize it here, seeing as the only thing that pops up are expensive books and lengthy court documents. I should've just told them to google it lol....

Thanks!