It seems like more algorithmic market making is taking place on the Nasdaq, NYSE, and futures exchanges than ever before. Seeing as how algorithmic trading is reactive rather than proactive, a sharp human trader should be able to pick up on some variables that the algorithms are triggering off of. I have successfully scalped US stocks since 1998 (first Naz, now NYSE), but I cannot seem to pick up the logic behind today's market making algorithms. Has anyone identified any logic behind the randomness? Let's get the ideas flowing and hopefully find an edge that we can exploit!