On September 8th, the dollar moved from around 160 yen to 153 in a matter of days. Toyota and Honda lost a currency tailwind they had been quietly leaning on. The Nikkei dropped 1,130 points the same day, as investors scrambled to reprice earnings that had never been as strong as they looked.

This keeps happening. And executives keep being surprised by it.

I've had some version of this conversation more times than I can count. A company's numbers are good. Margins are healthy. Then the yen moves seven points, and someone in the room says, unprompted, well, that explains the quarter. Nobody asked. It just came out, because everyone already suspected it.

That's not a strategy. That's a subsidy. And subsidies get withdrawn without notice.

The companies I respect most in Japan do not build their competitiveness on a favorable exchange rate. They build it on something the exchange rate cannot touch. Pricing power that comes from actually being better. A product nobody else makes. A service level competitors cannot match. A brand people will pay a premium for, regardless of what the yen is doing that week. When your advantage is structural, a currency swing is background noise. When your advantage is the currency, a swing is an earnings call you dread.

Here's the uncomfortable test. Ask yourself honestly. If the yen strengthened 10 percent tomorrow and stayed there, would your business still be competitive? If the answer is, we'd need to renegotiate with suppliers, or we'd need to cut costs, you already know where your real vulnerability sits. It was never the exchange rate. It was the absence of anything else to compete on.

I wrote about this back in 2015, when the same fretting was happening over a weakening yen instead of a strengthening one. The direction changes. The dynamic does not. Executives spend enormous energy trying to predict a number they cannot control, and comparatively little energy on the one lever they actually can control, how frequently they bring genuine value to market. Companies that innovate new products and services constantly do not need to forecast the yen, because they are not depending on it.

Bel Japon is a good illustration of what this looks like in practice. Their flagship product, Kiri cream cheese, is entirely exchange-rate exposed. It's made in France and imported into Japan as-is. But everything Bel has built around that flagship is not. A fruit cream cheese line they now manufacture domestically. Co-branded products with major Japanese confectionery brands, generating 35 to 40 new items a year on unusually short development timelines. None of that came from France telling Japan what to sell. It exists because Bel Japon keeps resetting what their product is worth to a Japanese consumer, one new flavor, one new format, one new partnership at a time, instead of waiting to see what the yen does to last year's product.

The counter-case is just as instructive. During the Abenomics years, a weak yen handed exporters like Toyota and Nintendo a windfall almost for free. Companies that leaned on that weak yen instead of using the breathing room to actually change found the advantage evaporated the moment the currency turned. And they had nothing else built to replace it. The yen was never the strategy. It was the anesthetic that let some companies avoid having one.

None of this means ignore currency risk entirely. Manage it. Hedge what needs hedging. And then stop checking the exchange rate every morning like it's a scoreboard. The real work is elsewhere.

Stop trying to predict exchange rates. The best way to hedge against exchange rate risk is to increase your rate of innovation. Because every time you innovate, you reset value. A currency move can erode the price of what you already sell. It cannot touch the price of something you haven't offered before, because that price is yours to set.

These recent currency swings are certainly not the last to expose which companies are actually strong and which are just lucky. The question worth asking your leadership team is not, what will the yen do next. Nobody in that room can answer that credibly. The question is, what are we building that will not care either way.

If you're interested in learning more about innovation and strategy, my books, Strategy on Your Own Terms and Disrupt or Be Disrupted, are available on Amazon. Links are in the description.