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by George Campbell mtwx.ca
My neighbor asked me last week why his Canadian dollar savings suddenly bought less when he tried booking a Florida vacation. “Didn’t Carney say the economy was strong?” he asked. I didn’t have the heart to tell him that what politicians say about currencies has roughly the same predictive power as a weather forecast for next July.
The Canadian dollar has dropped from its 2021 highs to around $0.72 USD today—down roughly 12% over the past 18 months. Meanwhile, U.S. politicians are complaining about a “too-strong dollar” hurting American exports while Canadian officials insist their fundamentals are sound. Both are talking. Neither is explaining what’s actually happening.
Currency movements follow arithmetic, not speeches. And the arithmetic is brutally simple: money flows toward higher returns, adjusted for risk. When the U.S. Federal Reserve holds rates at 4.00-4.25% while the Bank of Canada cuts to 2.50%, the interest rate gap creates a 150-175 basis point incentive for capital to flow south. That gap doesn’t care about political narratives or national pride. It just moves money.
Four pipes determine everything. Think of the global economy as a house with four pipes connecting every country’s financial system: trade flows (current account), investment flows, borrowing flows, and currency reserves (collectively the financial account, including reserve assets). When money flows through one pipe, the others adjust automatically. Politicians talk as if they control the valves, but they’re mostly just reading gauges and hoping nobody notices.
Canada’s situation illustrates this perfectly. Lower interest rates were supposed to stimulate borrowing and growth. They did stimulate something—capital flight. When Canadian investors can earn 150-175 basis points more in U.S. Treasuries with lower inflation risk, they don’t need a PhD in economics to figure out where to put their money. Trade deficit (C$4.4 billion in July 2025), portfolio investment outflows (C$43.7 billion in Q2), and currency reserves under pressure—all four pipes moving in the same direction.
The U.S. faces the opposite problem with the same arithmetic. A strong dollar makes American exports more expensive and imports cheaper, widening the trade deficit politicians love to complain about. But that strong dollar exists because of the interest rate differential and reserve currency demand that same politicians benefit from. High interest rates, reserve currency status, and a weak currency are difficult to sustain simultaneously with free capital flows. The four pipes don’t work that way.
The carry trade reveals the real game. Professional currency traders don’t listen to politicians. They borrow in low-rate currencies (the Japanese yen at 0.50% in 2025) and invest in high-rate currencies (U.S. dollar at 4.00-4.25%). That 350-400 basis point spread represents pure profit if exchange rates hold steady. When they don’t hold steady—when the Bank of Japan raises rates or the Federal Reserve cuts—the unwinding happens fast. August 2024’s carry trade unwinding demonstrated what happens when arithmetic overrides optimism, with the Nikkei plunging 12% in a single day and triggering global market turmoil.
Japan tried for decades to talk the yen higher through “verbal intervention.” It worked for hours, sometimes days. Then money remembered the interest rate differential, and the yen resumed its path. The interest rate gap won every argument.
Countries face an impossible trinity: You can have two of these three things, but never all three simultaneously: (1) Fixed exchange rates, (2) Independent monetary policy, (3) Free capital flows. This is the trilemma that constrains every central bank. Politicians promise all three anyway because admitting the constraint sounds like weakness.
China chose fixed rates and monetary independence by restricting capital flows—hence capital controls. The U.S. chose monetary independence and capital flows by letting the dollar float—hence exchange rate volatility that politicians blame on “currency manipulators.” The Eurozone tried to cheat the trinity through a shared currency—hence Greece’s inability to devalue its way out of crisis. The arithmetic doesn’t negotiate with political preferences.
Reserve currency demand papers over U.S. contradictions. The dollar stays strong despite massive deficits because foreigners need dollars for international trade and want dollars for safe haven storage. That demand—driven by the dollar’s status as the primary reserve currency and safe-haven asset—lets the U.S. run larger deficits longer than arithmetic alone would allow. But it also means American manufacturers compete with a currency that works against exports while benefiting imports. The four pipes adjust whether you like the adjustment or not.
The September 10, 2025 U.S. 10-year Treasury auction saw record-low primary dealer participation at just 4.2% for house accounts—not because demand was weak, but because end-investor demand was so strong that dealers didn’t need to warehouse bonds. Money was flowing into U.S. assets exactly as the interest rate differential predicted.
The Canadian dollar will strengthen when either Canadian rates rise relative to U.S. rates, or Canadian trade performance improves enough to offset the rate differential, or global investors decide they need Canadian dollar reserves for some reason. Political speeches affect none of these variables. Interest rate gaps, trade flows, investment returns, and reserve demand determine currency values. Everything else is theater.
My neighbor eventually booked his Florida vacation anyway, paying more in Canadian dollars than he expected. He understands now that currency movements follow money, and money follows returns. Politicians will keep promising they can control exchange rates through better negotiations or tougher talk. The four pipes will keep adjusting to interest rate differentials and trade flows, indifferent to the speeches.
So it goes.