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by George Campbell, mtwx.ca
Politicians hold a press conference about tariffs. A week later, people buy more imported stuff anyway. In July, the goods trade deficit widened 22.1% to $103.6 billion. Reporters act surprised.
You don’t have to be.
The Core Accounting Identity: Your Budget is the Nation’s Ledger
Picture your household budget like a checking account: “Money Coming In” and “Money Going Out.” If you’re spending more than you earn, you need to borrow the difference. Where does that borrowed money come from? Someone who has extra cash. But here’s the key: they need dollars to lend you dollars. They get those dollars largely when you buy things from them.
Countries run on ledgers too. When our government spends more than it takes in, somebody has to supply the extra dollars. A lot of the time that “somebody” is the rest of the world buying U.S. bonds. But foreigners need dollars to buy those bonds. Where do they get them? Largely when we buy their goods and services. Dollars flow out for imports, and flow back to purchase our IOUs.
Current account + financial account ≈ 0 (ignoring small timing/statistical noise). Two sides of one ledger. This is the fundamental Current Account Identity that governs international trade and finance.
Our brains tend to miss this because of mental accounting. We put “tariffs” in one mental bucket and “budget deficits” in another, and we cheer for wins in both buckets. But the buckets are connected through the Current Account Identity. You can’t tighten trade while simultaneously demanding more foreign savings to fund bigger deficits without those same foreign dollars coming from somewhere—usually our own import spending.
The Government Deficit Trap: Why Imports are Forced
If you like Charlie Munger’s approach, invert it: What would have to be true for “tariffs shrink the trade gap” while “deficits rise and foreigners finance them”? Either (a) Americans suddenly save a lot more (so we don’t need foreign savings), or (b) imports collapse despite strong spending. Neither is what we’re actually doing. So the Current Account Identity wins and the headlines lose.
There’s a boring but powerful line of arithmetic under all this: When net foreign investment flows into the U.S. (they buy our bonds, buildings, businesses), our current account must move the other way over the period. In plain English: if the world is financing us, we’re likely buying more from the world. Understanding the Government Deficit Trap is crucial for separating financial reality from political rhetoric.
This doesn’t mean the timing is instant or the amounts match perfectly month to month. Americans could theoretically save more to reduce the need for foreign financing, or the Federal Reserve could complicate things through monetary policy. But over meaningful periods, the relationship holds because the ledger has to balance. This is the power of the Current Account Identity.
That’s why you can see imports rise even when tariffs go up. It isn’t consumers “defying” policy; it’s consumers doing what the math requires when government borrowing is big and steady. Tariffs mostly change who pays (you) and how much it costs (more), not the direction the ledger needs to move.
Sure, tariffs can shift which specific goods we import – fewer Chinese widgets, more Mexican widgets. But when government borrowing stays high, the total import demand usually finds a way to satisfy the accounting identity, even if it takes more expensive routes.
You’ll also hear “But Japan just changed what they buy.” Sure—month to month, any single country can speed up or slow down its purchases as hedging costs and local yields change. The key isn’t the wiggle; it’s the net. Across the system, if we borrow more, someone supplies more savings. The ledger balances whether we like it or not.
How to Use This (Practical, Not Political)
Watch the book, not the podium. Big federal deficits usually mean we’ll see persistent demand for foreign savings—and, over time, more imports to supply the dollars.
Expect detours to be expensive. Tariffs can raise prices without changing the destination the math is pushing us toward.
Invert promises. When you hear “smaller trade gap and bigger borrowing,” ask: Where do the dollars come from? If the answer is “from nowhere,” it’s theater.
If you remember nothing else, keep the jars in mind: money that arrives to fund our borrowing tends to be the same money we sent out when we bought other people’s goods. Two sides, one ledger.
FAQ: The Trade Deficit and The Ledger
Do Tariffs Reduce Trade Deficits?
Tariffs generally fail to reduce the overall deficit because the Current Account Identity forces the ledger to balance. When government borrowing remains high, foreign investors need dollars to buy U.S. bonds—and they get those dollars primarily by selling us goods. Tariffs mainly shift the source of the imports (from China to Mexico, for example) and raise prices, but they don’t eliminate the mathematical need for imports when we’re borrowing heavily from abroad.
Why Do Imports Increase When We Borrow More?
When the government runs a large deficit, it issues bonds to be financed by foreign investors (Financial Account surplus). Those foreigners need dollars, which they primarily acquire from us buying their goods (Imports/Current Account deficit). The two are mathematically linked through the balance of payments. This is the Government Deficit Trap—high borrowing creates persistent demand for imports regardless of trade policy.
What is the Current Account Identity?
It’s the economic rule that dictates the Current Account (trade in goods and services) and the Financial/Capital Account (investments and borrowing) must net out to approximately zero. If foreigners finance our debt (Financial Account surplus), we must be buying more from them than they buy from us (Current Account deficit). This isn’t a theory or political position—it’s an accounting identity that must hold true by mathematical definition.
Source: U.S. Census “Advance Economic Indicators,” July 2025; Congressional Budget Office deficit projections
The Deficit Trap: This math problem forces higher imports, but it’s only one side of the ledger. Next, read our analysis on the 40% Debt Service Cliff to see the domestic impact of this financial identity.