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Price as Field

This monograph develops a structural theory of price sensitivity that transforms threshold-based measurement into a unified geometric and field-theoretic framework. Starting from an extended Price Sensitivity Meter (PSM-5), in which elicited price points are interpreted as level-set constraints, we derive a parametric purchase probability function defined over price. The resulting function is shown to be unimodal, intrinsically non-monotonic, and governed by a dual-curvature structure reflecting two opposing mechanisms: a normative regime in which price acts as a signal of quality, and a constraint regime in which price acts as a cost.