ResearchResearch paperLarge Language Models · Reinforcement Learning · Business, Funding & Industry1 source · Oct 7, 2026

Validity Without Ground Truth: What Stated-Preference Economics Offers the Evaluation of Language Models

We demonstrate the approach using a published water-quality stated preference economic valuation survey (Vossler et al. 2023) administered to six models.

Key points

  • Many of the questions now put to large language models have no correct answer to score against: what a policy is worth, which option a user should choose, how to weigh competing values.
  • Stated-preference economics has faced this problem for decades.
  • We argue that this framework is a general method for evaluating language models, and we set out what each concept means for LLM evaluation.
  • In this economic application, the validity tests take the form of predictions from economic theory: demand should slope down, and willingness to pay should respond to the scope of the good and to income.

Sources (1)

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