What a Fibonacci retracement is (and what it is not)

Take any completed price swing: a low to a high, or a high to a low. A retracement asks a simple question about the pullback that follows: how much of that swing did price give back?

The answer is expressed as a fraction of the swing. Give back a third of the move, and you are near the .382 level. Give back half, the .50. Give back most of it, the .618 or .786. These ratios are just measurements — a ruler laid against the swing.

Why traders watch these levels

Markets spend most of their time in pullbacks and rallies inside larger structures. Traders who buy trends want the pullback to end somewhere sensible; the retracement grid gives everyone a shared set of somewheres. The .50 and .618 in particular are watched by enough participants that reactions there become partly self-reinforcing: people expect a response at the level, so they act at the level, so the level responds.

What a retracement is not

A retracement level is not a floor, and it is not a prediction. Price slices through perfectly good .618 levels every day. A level only means: this is a measured, widely watched place where a reaction is plausible. Whether a reaction actually happens is something you observe, not assume — which is why FibSetups pairs every zone with a confirmation ladder instead of treating the touch as the trade.

The anchoring problem

Two traders can draw different retracements on the same chart because they anchored different swings. That is the real weakness of hand-drawn fibs: the level is only as good as the swing selection behind it. FibSetups solves this mechanically — swings must be confirmed before they anchor a grid, every qualifying swing gets a grid, and zones only form where independent grids agree.