When data on actual choices are not available, researchers studying preferences sometimes pose choice scenarios and ask respondents to state the actions they would choose if they were to face these scenarios. The data on stated choices are then used to estimate random utility models, as if they...

When data on actual choices are not available, researchers studying preferences sometimes pose choice scenarios and ask respondents to state the actions they would choose if they were to face these scenarios. The data on stated choices are then used to estimate random utility models, as if they...

This paper discusses how limited ability to assess patient risk of illness and predict treatment response may affect the welfare achieved by adherence to clinical practice guidelines and by decentralized clinical practice. I explain why predictive ability has been limited, calling attention to...