I believe that market making is the 2nd oldest profession... You'll probably have better luck in getting the 1st oldest profession to reveal their " subtleties"...
any shop keeper is a market maker. even walmart. do you really think 'em sneakers u bought at the mall for 90bucks really cost that much at rival in port of long beach? there are alot of market making ops going on in between... the oldest profession... lemme guess... prostitution?