The Dollar: The World's Axis and Its Smile

Series: Macro Observations · Part 4. The previous pieces discussed liquidity and rates, mostly about the US. But America's currency is the world's currency – this piece is about the dollar, the axis of global finance, and how its strength radiates to every corner.

011. Why the Dollar Is the "Denominator of Everything"

To understand the dollar, first grasp one fact: it is not just America's currency – it is the denominator of the entire global financial system.

This statement plays out on several levels:

• Reserve currency: Roughly 60% of global central bank foreign exchange reserves are in dollars. It's the "emergency stash" for every country.
• Trade invoicing: A vast amount of global trade (especially commodities – oil being the classic "petrodollar") is priced and settled in dollars.
• Global debt: This is the most critical point – there is a mountain of debt around the world borrowed in dollars. Countless non-US governments and corporations have issued dollar-denominated debt.

Precisely because the dollar is the "unit of account" and "debt currency" for so many things, its strength or weakness is not just America's business – it is the denominator of global finance. Move the denominator, and everything priced in it, everyone who owes it, is affected. That's why the dollar is called the "axis of the world." Understand this, and you understand why a country halfway around the globe can see its currency collapse and face a debt crisis just because the Fed twitches.

And this axis has a captivating, counterintuitive pattern of motion – it smiles.

022. The Dollar's Smile: Strong at Two Opposite Extremes

The "Dollar Smile" theory is, in my view, the most elegant framework for understanding the dollar. It describes a counterintuitive fact – the dollar strengthens in two completely opposite scenarios; it only weakens in the middle. Plot these three states, and you get a smile: high on both sides, dipping in the middle.

Left side of the smile (strengthening scenario 1): Global panic, risk-off. When the world faces a big crisis – financial turmoil, war, systemic panic – global capital frantically rushes to the safest haven, and that haven is the dollar (and US Treasuries). Even if the crisis originates in the US, money still flows into the dollar because it is the deepest, most trusted safe asset. So the more chaos in the world, the stronger the dollar. This is the dollar in risk-off mode.

Right side of the smile (strengthening scenario 2): American exceptionalism. When the US economy is booming, far outperforming the rest of the world (faster growth, higher rates), global capital pours into dollar-denominated assets to chase higher US returns. So the more America stands alone, the stronger the dollar. This is the dollar in "America exceptionalism" mode.

Bottom of the smile (weakening scenario): Global synchronized prosperity, America no longer unique. When the world economy is broadly strong, other regions (Europe, emerging markets) pick up and narrow the gap with the US, capital no longer needs to pile into the dollar and flows to higher-return non-US assets. So the dollar weakens only when the world is in synchronized prosperity and America is no longer the sole outperform.

This framework's beauty is that it translates "dollar strength" into "what state the world is in" –

Watching the dollar is, to some extent, reading the global temperature of risk and growth. That's its value as a positioning tool – the dollar tells you roughly where the world stands on that smile.

033. A Strong Dollar: The Wrecking Ball Over the World

Of all the dollar's states, a strong dollar deserves special caution, because for the world outside the US, it is often a wrecking ball.

The mechanism goes back to the fact that the whole world owes dollar-denominated debt. Imagine an emerging-market company that borrowed a dollar-denominated bond. When the dollar strengthens:

• It must convert its local currency into dollars to repay the debt, and the local currency has depreciated against the dollar – meaning it needs more local currency to repay the same dollar debt – the debt burden has been increased out of thin air.
• A strong dollar typically comes with high US rates (right side of the smile), meaning the cost of refinancing is also higher.
• Capital flows out of emerging markets to chase the strong dollar, causing capital flight, further local currency depreciation, and a vicious cycle.

That's the "strong dollar wrecking ball" – it tightens global dollar liquidity, squeezing everyone who borrowed within the dollar system. Historically, many emerging-market crises (from Latin America to Asia) have been accompanied by a strong dollar. The damage of a strong dollar to the world is essentially a global monetary tightening: it makes the global denominator – the dollar – more expensive, and thus all dollar-denominated debt and all economies dependent on dollar liquidity feel the pinch.

Conversely, a weak dollar is a relief for the world (especially emerging markets): dollar debt burdens ease, capital flows back, local currencies appreciate, valuations recover. This is the core logic behind my earlier piece on global capital flows – the turning point of a strong dollar cycle is often the starting point for emerging markets. Once the dollar slides from the "US exceptionalism" right side to the "global synchronized prosperity" bottom, non-US assets that have been suppressed by the strong dollar for years may see a double whammy (low valuations + capital inflows).

So the direction of the dollar pulls several key threads:

• Emerging markets: Strong dollar is a headwind, weak dollar is a tailwind.
• Commodities: Mostly priced in dollars, usually move inversely to the dollar (strong dollar suppresses commodities, weak dollar is bullish).
• US multinationals: A strong dollar erodes their overseas earnings (when converted back to dollars), and vice versa.

044. De-dollarization: Exaggerated Narrative vs. Real Stickiness

No discussion of the dollar avoids the hot topic of de-dollarization. Every so often, the rhetoric flares up: "The dollar hegemony is ending," "Some other currency will replace the dollar." My view is structurally grounded.

My judgment: De-dollarization is a real but extremely slow, very long-term process – far slower and more distant than its proponents claim. The dollar's dominance has powerful stickiness, rooted in several hard-to-shake structures:

• Network effects: Everyone uses the dollar, so you have to use the dollar – this self-reinforcing network effect is incredibly hard to break. Like a language, the more people speaking it, the harder to switch.
• No real substitute: To replace the dollar, you need a currency that is equally deep, equally trusted, equally freely flowing, and backed by a pool of safe assets (a market as large as US Treasuries). Currently, no currency in the world meets all these conditions simultaneously.
• Exorbitant privilege: The US enjoys enormous benefits from the dollar being the world's currency (it can borrow at lower cost, export its monetary policy). It has no incentive to give that up, and other countries lack the power to force a change.

So I classify de-dollarization as a structural variable worth tracking long-term, but not one to base short- or medium-term judgments on. It's a slow variable measured in decades, not a tradable theme for next year. It's right to use it to understand the long-term evolution of the global order; it's wrong to predict the dollar's collapse next year – that is mistaking a slow variable for a fast signal.

055. How to Use the Dollar to Position: Read It, Don't Bet It

Let's synthesize the above and talk about "how to use it." Consistent with the rest of this series, I use the dollar to position, not predict.

I don't try to bet whether the dollar will be up or down next quarter (it's driven by too many variables, extremely hard to predict). What I do is use the dollar's current state and direction to read the global risk and growth environment, and then check whether my global allocation is aligned:

• If the dollar is strengthening in risk-off mode (left smile), the world is panicking – I check: Can my portfolio withstand this risk-off? Do I have enough safe assets?
• If the dollar is strengthening due to US exceptionalism (right smile), capital is flooding into the US – I check: Am I over-concentrated in US assets, with no exposure to non-US while they are extremely undervalued? (Remember the piece on overseas diversification.)
• If the dollar starts to weaken from strength (sliding toward the bottom smile), it may signal the world is moving toward synchronized prosperity and a tailwind for non-US assets – I check: Have I allocated some non-US exposure for this potential repricing?

That's how to use the dollar to position – it doesn't tell me the future, it tells me 'where the world stands on the smile right now' and whether my portfolio matches that position. The dollar is the single most important price in the world. Read its smile, and you read what global capital is afraid of and what it is chasing.

066. Final Words

The dollar is the axis of this world. It's the denominator of global finance, the currency in which countless debts are denominated, the safe haven in times of panic. Every move it makes radiates into every corner – from emerging markets to commodities, from multinational profits to global liquidity.

And its most captivating feature is that smile – it strengthens at two completely opposite extremes (global panic, US exceptionalism) and weakens only in the middle (global synchronized prosperity). This smile curve translates abstract "dollar strength" into a concrete "state of the world," turning the dollar into a key for reading global risk and growth.

My discipline, as with all macro variables, is: read it, don't bet it. I don't predict its next move (nearly impossible); instead, I use its current position to locate the global landscape and check whether my portfolio fits. As for grand narratives like "de-dollarization," I place them on a decades-long slow variable track and don't let them interfere with medium-term judgments.

If I had to leave just one line –

The dollar is the most important price in the world. Its smile tells you where the world stands – panic, exceptionalism, or synchronized prosperity. Don't bet its direction; read what it's telling you, then check: does your global allocation deserve its smile right now?

Next, we'll dismantle the underlying variable that is reshaping both rates and the dollar, and reshaping our era itself – inflation, and how it went from "transitory" to "structural."

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Risk Disclaimer: This article is a macro framework study and does not constitute any investment advice. Markets are risky; invest with caution.