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Classify a Day's Moves as Risk-On or Risk-Off

On a certain day, the S&P 500 falls 2.0 percent. AUD/JPY falls 1.5 percent. USD/JPY falls 1.0 percent. USD/CHF falls 0.5 percent. EUR/USD is flat. Gold rises 0.8 percent. The ten-year US yield falls 12 basis points.

Classify each. Stocks down is risk-off. AUD/JPY down, the classic risk barometer, is risk-off: investors sell the growth-linked Australian dollar and buy the yen. USD/JPY down means the yen strengthened, which is a safe-haven move. USD/CHF down means the franc strengthened, also a haven move. Gold up, and yields down, point to demand for safety.

EUR/USD flat is ambiguous: the euro does not behave as a clear haven or risk currency, and its moves depend on the cause.

The pattern is consistent: a risk-off day. All the havens, yen, franc, gold, and bonds, rose. The risk-sensitive currency, the Australian dollar against the yen, fell.

Now see what it implies for trading. On such a day, long positions in yen crosses are under pressure, correlations among them rise, and diversification is smaller than usual. A trader long EUR/JPY, GBP/JPY, and AUD/JPY has three positions on one risk-off bet.

Use this classification to check your own exposure before the day starts, by tagging each open position as risk-on or risk-off.

Compute the total risk by tag. If it is above your limit, reduce.

Exercise: review the last big market down day and list which of your positions were risk-on.

Officials talk. A finance minister says the currency's moves are "excessive" or "being monitored closely." No money changes hands, yet the market reacts, sometimes sharply.

Such statements work because they raise the probability of real action, and traders adjust their positions accordingly. The effect often fades if the words aren't followed by anything, which is why officials escalate the language over time.

For a scalper, verbal interventions create short, sharp moves with unclear direction at the start and a fade afterwards. They also tend to land at awkward times, such as the Asian morning or the middle of a press scrum.

The reaction is usually a fast spike in one direction, then partial retracement within minutes. Spreads widen at the same moment.

Anyone trading yen, yuan, Swiss franc or other currencies with active policymakers benefits from following official comments, especially when the currency is near a level that has caused concern.

Has the language of officials ever been used to anticipate a move, or does it only make sense afterwards?

The point about rising correlations on risk off days is the most practically important one. On normal days, EUR/JPY, GBP/JPY and AUD/JPY might move somewhat independently, but on a strong risk off day, they tend to fall together as the yen strengthens across the board. A trader holding all three with 1 percent risk each is effectively risking 3 percent on one theme. Tagging positions by their risk sensitivity, as suggested, shows this exposure clearly. It's a better measure of real risk than counting each trade separately, and it often shows that a seemingly diversified book is really one large bet on the yen.

Tagging positions as risk-on or risk-off is something I started after a bad Tuesday a couple of years ago. I was long GBP/JPY, long AUD/USD and long NZD/USD, and I thought of those as three separate ideas. A sharp equity sell-off arrived, all three lost together, and my planned 1 percent per trade turned into a day worth about three.

Now I keep a small spreadsheet with a column for the theme of each open trade. If more than two sit under the same tag, I either skip the new one or halve its size. It is crude, but it catches the problem before the day begins, which is when I need it.

I would add that EUR/USD staying flat on such a day, as in your example, tells me something too. If it stays quiet while the yen crosses fall, I treat it as a cleaner place to trade, since the risk theme is not driving it.