# Shortening of the Thrust

Also known as: SOT.
A Wyckoff concept (Analytics) in the LuxAlgo Library, with 1 indicator implementation.

## What is shortening of the thrust?

Shortening of the thrust (SOT) is the Wyckoff observation that each successive push to a new high or low gains less ground than the one before. The trend is still printing new extremes, but the distance each one adds beyond the previous extreme keeps shrinking, which reads as the force behind the move tiring.

The term comes from the Wyckoff tradition of reading price and volume together, and David Weis treats it in detail in Trades About to Happen (2013), his modern adaptation of the method. Volume decides the interpretation, following [effort vs result](https://www.luxalgo.com/library/concept/effort-vs-result/): shortening on heavy volume is read as effort buying little progress because the other side is absorbing it, while shortening on light volume is read as the trend's own participants withdrawing.

SOT describes deceleration, not reversal. Trends can keep shortening for several more pushes, so practitioners wait for a change of character, such as a forceful move the other way on expanding volume, before treating it as a turn.

## How to identify shortening of the thrust

SOT is a sequence, not a single bar:

1. Find at least three consecutive pushes to new extremes in the same direction.
2. Measure each push's gain beyond the prior extreme: new high minus previous high, or previous low minus new low.
3. Check that the gains shrink in order, with the latest push the smallest.
4. Compare the volume behind each push, then wait for a change of character before acting.

## How traders use it

- Protecting positions: shrinking thrusts in a held trend are a cue to tighten stops or take partial profits rather than add.
- Inside Wyckoff ranges: shortening declines into support, or shortening rallies into resistance, set the context for the tests at those edges, such as a [spring](https://www.luxalgo.com/library/concept/spring/) or an [upthrust](https://www.luxalgo.com/library/concept/upthrust/).
- Measured by wave: [Wyckoff wave and volume studies](https://www.luxalgo.com/library/concept/wyckoff-wave-and-volume-studies/) make the volume side explicit by totaling the volume behind each push.

## Shortening of the thrust vs related reads

- **Effort vs Result** (https://www.luxalgo.com/library/concept/effort-vs-result/): Weighs volume against progress on any bar or swing. SOT is a price-only sequence of shrinking gains, which effort vs result then explains.
- **Momentum Expansion vs Contraction** (https://www.luxalgo.com/library/concept/momentum-expansion-vs-contraction/): Momentum contraction reads deceleration from an oscillator. SOT reads it directly from the distance between successive price extremes, with no indicator involved.
- **Trend Exhaustion** (https://www.luxalgo.com/library/concept/trend-exhaustion/): The broader diagnosis, assembled from several kinds of evidence. SOT is one specific piece of that evidence, measured from the extremes themselves.

## FAQ

### What does SOT mean in Wyckoff analysis?

Shortening of the thrust: each new high or low in a sequence clears the previous one by less, a warning about the trend's strength rather than a trade signal by itself.

### How is shortening of the thrust different from divergence?

Divergence compares price with an oscillator such as RSI or MACD. SOT uses price alone, the shrinking gain from one extreme to the next, with volume as the explanation. The two often appear together.

### How many pushes does SOT need?

At least three, so there are two gains to compare and a sequence to judge. A single smaller push is ordinary variation, not shortening.

## Implementations in the Library

- Shortening of the Thrust (LuxAlgo): https://www.luxalgo.com/library/indicator/shortening-of-the-thrust/

## Related concepts

- Re-accumulation vs Re-distribution Diagnosis: https://www.luxalgo.com/library/concept/re-accumulation-vs-re-distribution-diagnosis/
- Absorption: https://www.luxalgo.com/library/concept/absorption/
- Trading-range Position: https://www.luxalgo.com/library/concept/trading-range-position/
- Point & Figure Cause Counting: https://www.luxalgo.com/library/concept/point-and-figure-cause-counting/
- Nine Buying/selling Tests: https://www.luxalgo.com/library/concept/nine-buying-selling-tests/
- Wyckoff Wave & Volume Studies: https://www.luxalgo.com/library/concept/wyckoff-wave-and-volume-studies/
- Composite Man: https://www.luxalgo.com/library/concept/composite-man/

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Source: https://www.luxalgo.com/library/concept/shortening-of-the-thrust/ (LuxAlgo Library, the encyclopedia of trading & technical analysis). Free to use with attribution: https://www.luxalgo.com/library/license/