It&#x27;s easy, from a conceptual standpoint:  Make sure everyone has enough to eat, a place to live, and access to healthcare etc.  Basically, make sure no one is in a position where they have to bargain away something of value in exchange for their life or to avoid pain.<p>A &#x27;position of power&#x27; in this case means not bargaining to avoid death or pain.  ALL people should be in such a position; no need to pick and choose.<p>That is also how you decide -- just ask &#x27;Will lack of this cause someone physical pain or death?&#x27;  If the answer is &#x27;yes&#x27; society should do its best to provide it to those who are not in a position to get it for themselves.<p>The goal is to make sure when people engage in a transaction that everyone walks away with more value than they brought to the table.  That&#x27;s the magic of the market.  But when people either need to strike a bargain or pay a dreadful price -- well, that&#x27;s why muggings don&#x27;t lead to market efficiency, isn&#x27;t it?