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What is the MACD Indicator?

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Used in a sentence

The Daily Ledger · Markets

The MACD line crossed above the signal line, which many traders read as a bullish momentum shift.

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Overview

MACD is a momentum indicator comparing two moving averages of price, one fast and one slow, to show whether a trend is gaining or losing steam. Its most-watched event is the crossover: the MACD line crossing above its signal line reads as momentum turning up, crossing below as turning down.
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Overview

MACD answers one question: is this trend speeding up or running out of gas? Two price averages, one fast, one slow — and when the fast one crosses the slow one, momentum just switched lanes. 😎

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Detail

MACD is built from three parts, all derived from price averages. The MACD line subtracts the 26-day average from the 12-day average, both weighted toward recent days, so a positive number means recent prices sit above older ones and a wider gap means a faster move. The signal line is a 9-day average of the MACD line itself, trailing behind it. The histogram is a set of bars showing the distance between those two lines. Reading it: the MACD line crossing above the signal line says momentum has turned up and crossing below says it has turned down, while the histogram gives earlier notice, because its bars shrink as a move fades. Two honest warnings: everything here is math on past prices, so MACD reacts after a move has already begun, and in a flat market the lines cross constantly and the signals are mostly noise.
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Detail

The recipe: fast average minus slow average is the MACD line, a 9-day average of that line is the signal line, and the bars are the gap between the two. The bars are the real tell, because they start shrinking while the crowd is still celebrating, before any crossover makes it official. Warning label, in bold: in a sideways market this thing crosses five times a week and means nothing, and trading those crossovers is how beginners donate money to the market. Since it's math on past prices, it confirms moves more than it predicts them. The party already started; MACD tells you whether it's still filling up or emptying out. 😎

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Analogy

A sprinter and a jogger running the same route — recent prices and older prices — with MACD tracking the gap between them. A widening gap means the move is accelerating and a narrowing one means it's tiring. The moment the sprinter falls behind the jogger, the crossover, is when everyone watching the race takes notice.
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Analogy

It's watching whether the group chat is alive: messages per hour today versus the monthly average. Today's rate crossing above the monthly average means the chat is heating up, and crossing below means it's dying and someone should post a meme. The crossover is the moment the vibe officially changed.
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AI explanations may contain errors · Not professional advice

Formal definition — The same term, explained the usual way

The Moving Average Convergence Divergence indicator comprises the differential between a 12-period and a 26-period exponential moving average (the MACD line), a 9-period exponential moving average thereof (the signal line), and a histogram representing their spread. Crossovers of the MACD line relative to the signal line and the zero axis are interpreted as momentum inflections. As a derivative of lagged price averages, the indicator exhibits latency and diminished reliability in non-trending, range-bound conditions.

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