Service quality is absent from official statistics despite services comprising two-thirds of consumer spending. We develop a scalable text-based method to measure quality across millions of establishments using consumer reviews. In the cross-section, a one standard-deviation quality increase corresponds to 9 percent higher spending. We use this hedonic gradient to bound quality-adjustment bias in inflation statistics. Aggregate service quality declined roughly 3 percent through late 2021, implying an upper-bound cumulative wedge of 2 percentage points, or 0.8 percentage points annually. Heterogeneity is substantial: limited-service restaurants show upper-bound annual bias of 0.24 percentage points. In financial markets, quality is not broadly capitalized into valuations, though consumer-facing industries show positive associations. Our approach extends hedonic quality adjustment from goods to services.