Moving average envelopes and trading bands help traders filter their decisions to trade. These tools set thresholds on the amount of movement above and below a moving average to trigger a decision to trade (or at least prompt further consideration by the trader).
A moving average envelope often takes a moving average line for a security or index and duplicates it, moving one line a certain percentage above and one a certain percentage below (the distance may depend on volatility levels). Price fluctuations in a security then might trigger a decision to sell when the price hits the upper band, or a decision buy when the price hits the lower band. If it crosses the bands it might be seen as a new trend.
Bollinger bands are one example of a more advanced trading band, used to discern the likely trading range of a security. A Bollinger Band is typically two standard deviations (or the average volatility of a price over a length of time) from a moving average line, both above and below the average.
Traders use technical indicators like Bollinger Bands to make predictions about future prices and verify how well a specific indicator works for a particular security, often by calculating the odds of success under similar market conditions.
A trader might look at the upper and lower Bollinger Bands surrounding that moving average line, which may indicate support and resistance levels in the current market. Current price moves that cross the upper or lower Bollinger Bands are used as triggering events for trades that take advantage of the fact that the price is likely to move back within the bands in the near future.
When a security's price closes above the upper Bollinger Band, it could be an indication that the security is overbought and may retreat slightly in price. A trader may consider selling the security or using put options to hedge against the potential price retreat. On the other hand, when a security's price dips below the lower Bollinger Band, it could be an indication that the security is oversold and could be a good entry point for a trader looking to take a position. He or she may consider buying the stock or exploring call options.
It can be useful to combine the Bollinger Bands of various time periods on the same security to search for indicators as well, but ultimately they are meant to be useful information to help construct a strategy, and not as de facto trade indicators unto themselves.
It is important to remember there is no single indicator that works well for all securities. Bollinger Bands are one of many ways to utilize technical analysis in trading. Traders can support their decision making with artificial intelligence tools to generate trade ideas, analyze signals to execute advantageous trades, or in other ways that support rational, effective trading decisions.
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