Já agora aproveito para transcrever um excerto do livro "Coming to My Trading Room" do Dr. Alexander Elder, disponível na loja do site, sobre a Abertura (open) da sessão que ontem de manhã reli por alto enquanto esperava pela electricidade...:-)
Penso que vem bem a propósito em dias como o de hoje. São conceitos básicos que convém rever de vez em quando. :-)
The opening price, the first price of the day, is marked on a bar chart by a tick pointing too the left. An opening price reflects the influx of overnight orders. Who placed those orders? A dentist who read a tip in a magazine after dinner, a teacher whose broker touted a trade but who needed his wife´s premission to buy, a financial officer of a slow-moving institution whot sat in a meeting all day waiting for his idea to be approved by a committee. They are the people who place order before the open. Opening prices reflect opinions of less informed market participants.
When outsiders buy or sell, who takes the opposite side of their trades? Market professionals step in to help, only they do not run a charity. If floor traders see more buy orders coming in, they open the market higher, forcing outsiders to overpay. The pros go short, so that the slighest dip makes them money. If the crowd is fearful before the opening aand sell orders pre-dominate, the floor opens the market very low. They acquire their goods on the cheap, so that the slighest bounce earns them short-term profits.
The opening price establishes the first balance of the day between out-siders and insiders, amateurs and professionals. If you are a short-term trader, pay attention to the opening range - the high and the low of the first 15 to 30 minutes of trading. Most openings ranges are followed by breakouts, which are important because they show who is taking control of the market. Several intraday trading systems are based on following opening range breakouts.
One of the best opportunities to enter a trade occurs when the market gaps at the open in the direction opposite your intended trade. Suppose you analyze a market at night and your system tells you to buy a stock. A piece of bad news hist the market overnight, sell orders come in, and that stock opens sharply lower. Once prices stabilize within the opening range, if you are still bullish and that range is above your planned stop-loss point, place your buy order a few ticks above the high of the opening range, with a stop below. You may pick up good merchandise on sale!
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