Investment Institute

The unstoppable dollar meets the immovable Mr Trump

Dollar cycles are longer than others because four self-reinforcing forces create inertia. They rarely reverse unless all four turn at once. Trump-era policies, fiscal strain and shifting global capital could trigger such a convergence.

04 Jul 2025

20 minutes

Sahil Mahtani

Chapters

01
The Fast view and introduction
02
Understanding dollar cycles
03
Why dollar cycles are so persistent
04
What breaks dollar inertia? Lessons from history
05
Is the Trump shock enough to break dollar inertia?
06
Conclusion
01

The Fast view and introduction

Brooklyn construction
Turning points in dollar cycles are rarely obvious and defy easy prediction.

The fast view

  • Full dollar cycles typically last 18 years – much longer than business, credit or equity cycles.
  • Their longevity stems from four reinforcing forces: trade and geopolitical shifts, interest rate and growth differentials, cross-border investment flows, and FX intervention.
  • Across three full cycles since 1970, dollar inertia has only reversed when all four forces flipped in unison – usually within a tight two–three year window.
  • A second Trump presidency could trigger such a convergence. Tariffs and fiscal expansion may widen twin deficits and drag on growth, while recoveries in China, Europe and Japan may narrow rate differentials.
  • With investment flows starting to shift and coordinated FX action being discussed, conditions are aligning for the first durable dollar downcycle since 2002.
  • The difficulty with a dollar down cycle is not what investors need to do, usually increasing exposure to non-US assets, but rather about recognising a prolonged down cycle is underway.

Introduction

Are we in a dollar bear market? There are good reasons to think so. Yet turning points in dollar cycles are rarely obvious. They defy easy prediction, often emerging only after macro, financial and geopolitical forces have already begun to shift.

That said, the convergence of those forces may be underway. Structural overvaluation, fading yield advantages, and tentative signs of capital reallocation all point to a possible turning point. Add to that a renewed Trump shock – tariffs, fiscal largesse, Fed pressure – and the ingredients for reversal become clearer.

We explore how and why those forces may be shifting, and what it would take to confirm a genuine turning point. The paper outlines the structural foundations of dollar inertia, the historical triggers that have broken it, and the emerging parallels that suggest this cycle may be nearing its end.

A timeline of dollar cycles

Authored by

Sahil Mahtani

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