Commutalisme
A baguette at €0.95
For a welfare recipient, this is nearly 5% of their daily budget. For a senior executive, it is 0.7%. The same product. A ×7 impact.
→ ×7 gap in real budget impactCommutalism structurally adapts the price of every good to your income.
An open, computable, equitable algorithm.
For the same good, the real budgetary impact varies tenfold depending on income. This is not an individual injustice — it is a structural flaw in the pricing system.
For a welfare recipient, this is nearly 5% of their daily budget. For a senior executive, it is 0.7%. The same product. A ×7 impact.
→ ×7 gap in real budget impactMedicines, energy, food: at a fixed price, these necessities eat proportionally more into lower incomes, regardless of any reimbursement.
→ Structurally unequal purchasing powerThe market treats all buyers as equals when they are not. Commutalism corrects this structural asymmetry through calculation — not through subsidies, not through taxes.
→ The formula replaces political arbitrarinesspeople below the poverty line in France (INSEE 2022)
the gap in budgetary impact of a baguette between a welfare recipient and an executive
maximum correction on a pure necessity for the most vulnerable profiles
The adjusted price index follows a deterministic and public calculation. No arbitrariness, no hidden subsidy — every component is verifiable and reproducible.
Your income is compared to the regional median (INSEE data). A ratio below 1 means you are below the median: the correction mechanically works in your favour.
Each good receives a luxury factor between 0 (pure necessity) and 1 (absolute luxury). It determines the β exponent and the maximum range of corrections in both directions.
The result is bounded between a floor (max reduction) and a ceiling (max surcharge), ensuring that no price becomes absurd — neither too low nor confiscatory.
For 1 kg of rice (base price: €2.65, pure necessity f = 0), here is what each profile would pay under a Commutalist system. Reference regional median: €2,147/month (national INSEE 2023).
Key principle
Above the median, the surcharge remains deliberately low on necessities (β↑ = 0.05). On luxury goods, it becomes substantial (β↑ up to 0.45). High incomes overpay little on basic needs, but much more on prestige goods.
Calculations using the Commutalism formula (f = 0, pure necessity). View the full formula →
Commutalism raises legitimate questions. We address them directly — honestly about what is resolved and what is not yet.
Select a product, enter your income and region. The formula does the rest — transparent, verifiable, instant.