Would somebody mind explaining this gap business to me? It looks like the high of the day on Tuesday was 206, but we only went down as far as 206.27 today (so far). How close does the movement have to be before the gap is considered "closed"?
Right. I remember that I promised to explain gaps.
When you get a gap up you basically prevented a huge amount of order from being executed since the stock never go thorugh the activation price of those limit orders. In the old days before computers and in psychology. When you get a gap up or down, you deny a bunch of people from buying or selling at the price they want. Now they remember that gap and either think they should probably get out if they get a chance to have that price again, or they should probably buy in the steal if the price dropped to that level again.
Whatever causes a memory of a price have an effect as a resistance or support in a stock chart. Again, the more people who remember the price, the stronger it is. Hence the closing of a huge gap (as it prevents more orders from executing) has a larger base of stock traders who remember. The reason why this reasoning is correct is proven by the fact that people do not trade TA based on a market capitalization chart, which accounts for all the hidden share dilutions. It is the price level and only the price level that everyone sees that's important. Since we are not logical animals, but emotional ones.
In modern days. A gap prevents orders from executing and forms a backlog of order that are still at that price for whatever reason. Wherever there's a large order (or order wall as I like to use it), the price will be attracted to it magnetically because the bots wants to trade to that price. A large amount of order presents lots of fees and commissions in modern days. So, one must not leave easy profit on the table.
Of course the market continues to evolve. My theory is probably already a dinosaur nowadays since we are moving to a 70% HFT traded world. The algorithms have moved from just trading faster and generating fees to cannibalizing each other. I just trade gaps because it is something that every TA believes in and still has a higher % of being true than being false. So its effect is still in play. With TA, the more people who believes in a phenomenom, the more it is true. So until the day when 50% of the bot algorithms stopped taking into account of gaps, I will trade the gaps.