The arithmetic of retaliation

The New York Post reports that President Trump has threatened France with 100% tariffs on wine unless Paris abandons its digital services tax — and that a senior French official has declared the matter "no longer up for debate" ahead of the G7, a characterisation a US official promptly dismissed as "not accurate." I offer no opinion on who is telling the truth. What I can say with some confidence is that when two proud nations begin a summit by disputing what was said before it opened, the prospects for a negotiated settlement are already narrowing.

Let me acknowledge the rational case on the American side. A digital services tax that falls disproportionately on US technology companies is, at minimum, a legitimate subject of bilateral grievance. If France taxes American-made revenues that escape the French exchequer through the ordinary mechanics of platform business, the United States has standing to object. I do not dismiss that complaint.

But a 100% tariff on wine is not a remedy proportionate to that grievance — it is a weapon chosen for visibility, for the satisfaction of appearing strong, and for the domestic political dividend of being seen to punish an ally. The last time I watched a great power dress up economic punishment as negotiating leverage — at Versailles, where the indemnity imposed on Germany was calibrated to satisfy creditors rather than to produce a stable European economy — the long-run consequences dwarfed anything the short-run negotiators had modelled. I am not equating a wine tariff with Versailles; I am noting that the habit of mind is the same.

The deeper problem is what economists would now call the aggregate demand effect of a generalised tariff war. A 100% levy on French wine raises prices for American consumers, reduces volumes for French producers, invites French retaliation on American goods, and — this is the part that tends to be omitted from the press release — contracts trade in ways that neither economy can easily replace. Every bilateral tariff fight of this kind is, from the perspective of the world economy, a contraction of the circular flow. Animal spirits — the confidence of importers, exporters, investors deciding whether to build the next warehouse — respond to that uncertainty long before any customs officer collects a dollar. (This last point is inference on my part, not something the Post's report directly establishes.)

The G7, as I understand it from inference rather than direct knowledge, was designed precisely as the forum where economies large enough to do each other serious damage could instead coordinate. That a meeting billed as covering a variety of economic and security issues — the NPR report notes as much in a separate context — is now being pre-empted by a bilateral ultimatum over wine and tech taxes suggests the architecture of coordination is under some strain. The remedy is not nostalgia for a more collegial era; it is a return to the principle that international monetary and trade arrangements are public goods requiring deliberate design, not prizes awarded to whichever negotiator blinks last.

My practical suggestion, for whatever it is worth across the decades: both parties should appoint technicians with genuine authority to resolve the digital tax question on its merits — the incidence of the tax, its consistency with OECD frameworks, the appropriate offset — and insulate that negotiation from the theatre of summitry. The wine will keep. The window for agreement, once a summit ends in visible failure, rarely does.