Research

What Do You Buy When No One’s Watching? The Effect of Self-Service Checkouts on the Composition of Sales in Retail. (working paper)

Buying items that are unhealthy or are of a private nature may carry a stigma and cause embarrassment. I analyze whether the anonymity provided by self-service checkouts changes customers’ shopping patterns in grocery stores. I look at a natural experiment where two stores in a grocery-chain implement self-service checkouts. Using a triple difference estimator, comparing …

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Research

The triple difference estimator (developed)

Triple differences has become a widely used estimator in empirical work. A close reading of articles in top economics journals reveals that the use of the estimator to a large extent rests on intuition. The identifying assumptions are neither formally derived nor generally agreed on. We give a complete presentation of the triple difference estimator, …

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