Taking into consideration affecting the markets thru volume, and and assuming that a trader has office support, that is clerical staff, it help and sales, etc. How much could one person trade and manage. I got to thinking about this with the Madoff case. Obviously, you can't buy 10 billion of oex calls without being noticed. I have heard that at a certain point size is going to be a problem, can one guy effectively manage 1 billion, 5 billion? There are no right or wrong answers. Along the same lines how much do you think Madoff was actually trading in the markets?