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Bollinger Bands® Introduction:
Bollinger Bands are a technical trading tool created by John Bollinger in the early 1980s. They arose from the need for adaptive trading bands and the observation that volatility was dynamic, not static as was widely believed at the time.

The purpose of Bollinger Bands is to provide a relative definition of high and low. By definition prices are high at the upper band and low at the lower band. This definition can aid in rigorous pattern recognition and is useful in comparing price action to the action of indicators to arrive at systematic trading decisions.

Bollinger Bands consist of a set of three curves drawn in relation to securities prices. The middle band is a measure of the intermediate-term trend, usually a simple moving average, that serves as the base for the upper band and lower band. The interval between the upper and lower bands and the middle band is determined by volatility, typically the standard deviation of the same data that were used for the average. The default parameters, 20 periods and two standard deviations, may be adjusted to suit your purposes.

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May 2013 Excerpt
"International"
The stars of the international scene have been the emerging markets, of that there can be no doubt. But why, you might ask? In a word, growth. With growth increasingly hard to find in the developed countries and the developed country governments acting clueless about what to do, the world's equity investors - and a bunch of bond investors hungry for yield - are turning to the one place where there is growth, even though the going is perilous. Simply put the prospects for the developed world seem dim, while the prospects for the developing world seem much brighter--even given the fact that they are scarier--and investing must be gotten on with.

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