“The trend is your friend” is a memorable Martin Zweig stock market quote. More instructive aphorisms might be: "The trend is your friend until it bends." (thanks to Investopedia: https://www.investopedia.com/terms/p/pattern.asp), or: “The trend is your friend, until the end when it bends.” (thanks to How The Market Works: https://education.howthemarketworks.com/the-trend-is-your-friend/). But what exactly is a trend, and how is it related...
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