The Champagne boundary was drawn by politics

Champagne lost 96 percent of its crop in 1910. Phylloxera had eaten the roots, and whatever the aphid spared was finished off by mildew, hail and flooding. Meanwhile demand from London, St Petersburg and New York sat at record highs.

So the houses bought grapes elsewhere. From the Loire, from the Languedoc, and according to persistent rumour from England: rhubarb. The growers called it faux champagne, and in 1911 they took to the streets. Cellars burning, wine in the Marne, cavalry in the villages.

The Champagne AOC boundary came out of those riots. Not out of soil surveys. Out of bargaining, panic and who held the upper hand. Which is exactly why an economist can now do something with it that no other wine boundary allows.

A line built from compromises

The trigger dates back to 1908, when the government announced it would delimit the appellation by decree. That first line covered the Marne and the Aisne and left the Aube out. It put two groups of growers against each other: the Aube wanted in, the Marne wanted the Aube kept out.

In 1911 the French government defined champagne in law for the first time. Nobody was satisfied. Troyes, historically the capital of champagne production and sitting in the Aube, fell outside the line. Growers there started protesting all over again, and in June the government handed them second-class status: deuxième zone. Meanwhile the law meant to relieve the grape shortage effectively halved the existing vineyard area.

Then came the war. Champagne sat within range of German artillery, villages and cellars were destroyed, and every stakeholder’s priorities shifted.

Legislation that held only arrived in 1927, and the decree of 29 June 1936 made the Appellation d’Origine Contrôlée official: five départements, 635 communes permitted to make champagne. That line has not moved since 1927.

A century on, there is a municipal boundary where one side may print “Champagne” on the label and the other may not. The hillside carries straight on.

Why that arbitrariness is a gift to economists

Jonathan Dries, an economist at LUISS in Rome, published a study in Journal of Wine Economics that turns the arbitrariness into a measuring instrument. The logic is tight.

If the boundary tracked terroir, you could never tell whether communes inside the AOC do better because of their status or because of their soil. But the boundary is political. Which makes the communes just outside a valid control group: same slopes, same rainfall, different paperwork.

Dries checks it rather than assuming it. He maps elevation, slope, ruggedness, average rainfall and soil quality across all 635 communes and their neighbours, and shows those variables run smooth across the line. No jump. The geography does not know where the appellation starts.

Whatever does jump, jumps because of the status.

Ten percent less unemployment

Communes just inside the line carry unemployment roughly one percentage point lower than their neighbours just outside. A small number, until you read it in relative terms: against a mean of 10.4 percent, that is a ten percent reduction. From one policy decision, eighty years old.

Where that employment sits is more interesting. Dries breaks it down by sector:

• Agriculture: close to double
• Manufacturing: roughly 50 percent higher
• Public sector: roughly 20 percent higher
• Construction and services: no measurable effect

Agriculture was predictable. Manufacturing makes sense the moment you picture what happens around champagne: pressing, bottling, disgorging, packaging, logistics. But the public sector figure is the odd one in the table, and it only explains itself through the municipal budget.

Higher on land, lower on business premises

Communes inside the AOC run a different tax regime from their neighbours. They levy higher rates on land and on real estate, while cutting rates on business property.

That is not an accident, it is the only sensible move available. Land licensed to produce champagne is scarce and cannot be relocated, so you can tax it harder without anyone leaving. What you collect there funds cheaper terms for the businesses you want to attract.

And the money shows up on the ground. A commune inside the boundary is about 7 percentage points more likely to run a healthcare facility. For an education facility the gap reaches 13 percentage points, against a mean of 39 percent. That has stopped being a wine statistic. That is a school in the village.

Five percent dearer to live, and nobody pushed out

Champagne land prices have climbed steeply over the past thirty years, driven by global demand and the disappearance of Soviet sparkling wine as a substitute. Dries finds rents and property prices per square metre roughly five percent higher inside the AOC.

Which raises the obvious worry: if land becomes unaffordable, viticulture crowds out everything else. Bakers close, young families leave, and what remains is a monoculture with a handsome label.

He tests it with a difference-in-discontinuities design across 1999 to 2019, and does not find it. The employment jump at the boundary was already there in 1999 and is the same size twenty years later. Commuting data from the French censuses shows no sign that people sorted around the boundary on housing costs either.

Where the research strains

Two things to carry alongside the conclusions.

The crowding-out test rests on two years. 1999 and 2019, with nothing in between. Whatever rose and fell across those two decades stays invisible. Temporary displacement that later recovered would not register in this design.

And the boundary carries more than status. An RDD isolates the effect of inside versus outside, but inside that line also sits a century of brand investment, tourist infrastructure and cooperative organisation. Dries measures what the boundary delivers. How much of that is the bare legal right to the word “Champagne”, and how much is the hundred-year machine behind it, this design cannot separate.

A smaller point that still counts: treatment is binary at commune level. A commune may make champagne or it may not, while not every parcel inside such a commune is classified. That biases the estimate downward rather than up, but it is not parcel-level precision.

Forty villages, eighteen years of waiting

The INAO has been reviewing an expansion of the AOC since July 2008. The deadline has slipped several times. The INAO now expects the process to conclude in 2026, adding forty communes and removing two.

Dries draws the implication straight away: if the boundary works the way he measures, those forty communes get the same effect. Lower unemployment, higher tax revenue, probably a school or a clinic that would otherwise have closed.

For the two being removed the logic runs in reverse, and the study says nothing about them. Anyone selling appellations as regional policy should be willing to name that half too.

Beyond France

Protected origin is not a French curiosity. The Netherlands, a country most people would not name as a wine producer, has run its own protected designations of origin for wine since 2017. The national agency RVO counts ten of them, including Mergelland, Vijlen, Maasvallei Limburg and Achterhoek-Winterswijk, on top of a protected geographical indication for every province. Dutch potatoes, cheese and asparagus carry the same instrument.

What nobody has done is measure what those boundaries deliver. Not with unemployment figures, not with municipal budgets, not by asking whether a village on the inside kept a school it would otherwise have lost. The data exists and the oldest of those wine designations is eight years old. Nobody has run the sums.

That is the usable lesson here. A geographical indication is not a marketing label, it is a spatial decision with a price, a border and losers on the far side. Champagne shows the effect can persist for decades. It does not show that it travels.

Next time someone tells you the Champagne boundary follows the terroir: it was drawn by men who sat down after three catastrophic years and failed to agree.

Frequently asked questions

Where does the Champagne AOC boundary run?

The AOC covers five départements and 635 communes, set by decree on 29 June 1936 on the basis of the 1927 law. The line has not changed since 1927.

Is the Champagne AOC being expanded?

The INAO has been reviewing it since July 2008 and expects to conclude in 2026. The proposed change adds forty communes and removes two.

Is champagne better because of the boundary or the soil?

For what is in the glass, soil matters. For the economy of the region, this research shows the boundary itself makes the difference: communes inside the line outperform neighbours with comparable soil, elevation and rainfall.

Sources

• The study: Dries, J. (2026). Champagne spillovers: Geographical indications and regional economic development. Journal of Wine Economics, 21(2), 107 to 122. doi:10.1017/jwe.2025.10096 (open access, CC BY 4.0)
• AOC delimitation and cahier des charges: INAO
• Regional figures: Comité Champagne
• EU framework for geographical indications: Regulation (EU) 2024/1143
• The 1911 riots, the 1908 decree and the exclusion of the Aube: Champagne Riots (en.wikipedia) · Révolte des vignerons de la Champagne en 1911 (fr.wikipedia) · VinePair, The historic riots that defined the Champagne region
• Dutch protected wine designations and provincial PGIs: RVO, Quality designations for wine
• Opperdoezer Ronde, Noord-Hollandse Gouda and Brabantse Wal Asperges: RVO, Quality designations for agricultural products