i posted this before from the Quantifiable Edges. Buying Fri dip has been easy money. So who went long last Fri?
http://quantifiableedges.blogspot.com/2010/03/after-down-fridays-over-past-year.html
"It is important to understand that this is what I often refer to as an âenvironmental edgeâ. In other words, it is something that has worked in the recent past and seems to be a result of the current market environment. It is not an edge that has persisted over a long period of time nor do I expect it to continue to persist for a long period of time from now. That doesnât mean it isnât a useful observation, though. In such cases where I believe a setup contains an environmental edge I will look to use it to my advantage until it appears to be losing its effectiveness. Of course I do this with all edges, but environmental edges are on a tighter leash than others."
http://quantifiableedges.blogspot.com/2010/03/after-down-fridays-over-past-year.html
"It is important to understand that this is what I often refer to as an âenvironmental edgeâ. In other words, it is something that has worked in the recent past and seems to be a result of the current market environment. It is not an edge that has persisted over a long period of time nor do I expect it to continue to persist for a long period of time from now. That doesnât mean it isnât a useful observation, though. In such cases where I believe a setup contains an environmental edge I will look to use it to my advantage until it appears to be losing its effectiveness. Of course I do this with all edges, but environmental edges are on a tighter leash than others."