An explicit piecewise-constant-curvature construction with power-law tails converts discrete arbitrage-free call prices into full risk-neutral marginal laws that exactly reprice inputs and are free of butterfly and calendar arbitrage.
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Arbitrage-Free Multi-Maturity Risk-Neutral Marginals
An explicit piecewise-constant-curvature construction with power-law tails converts discrete arbitrage-free call prices into full risk-neutral marginal laws that exactly reprice inputs and are free of butterfly and calendar arbitrage.