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Yen pairs and the three-digit habit

Yen pairs are quoted to two or three decimal places, while most others use four or five. A pip is the second decimal on yen pairs, not the fourth.

The difference creates habits that do not transfer. A stop of 10 pips on EURUSD is a small fraction of its daily range. A stop of 10 pips on USDJPY is 0.10, which is also small, but the typical movement per minute on the pair is different.

Yen crosses have bigger typical ranges in pip terms than EURUSD. A strategy sized in pips needs recalibration when moved across.

Pip value also differs. On a USD account, a pip on USDJPY is worth roughly seven dollars per lot at current rates, not ten.

Round numbers behave differently. The 150.00 level on USDJPY has a gravitational pull comparable to the 1.1000 on EURUSD, but the intermediate levels, 149.50 for example, carry more weight in the yen's world.

Which pip-denominated parameters were carried over from another pair without adjustment?

When equity markets fall sharply, the yen often strengthens. USDJPY drops, and every yen cross drops with it: EURJPY, GBPJPY, AUDJPY. Anyone long several of these at once has a single position in disguise.

The reason involves carry trades. Investors borrow yen at low rates to buy higher-yielding assets. When risk sentiment sours, they unwind, buying back yen. The move can be fast and one-directional, with positioning amplifying it.

For short-term traders the lesson is correlation. Opening long positions on three yen pairs doesn't diversify anything. It triples exposure to one theme. In a sudden risk-off burst, all three can move against the trader together, with slippage on each.

Speed matters too. These moves can happen within seconds in thin liquidity, particularly during Asian hours when Japanese markets are open and other desks are absent.

A quick test of correlation is to overlay the pairs on a one-minute chart and notice how they move in lockstep during stress, then diverge during calm.

Which yen cross is the most reliable sign that a risk-off wave is starting?