Measure a Dasher incentive's effect on supply

Causal inferenceHard

Problem. DoorDash offers a bonus (e.g., "complete 20 deliveries this week, get $50") to boost Dasher supply. Dashers opt in. How do you measure whether it actually increased supply?

Before you reveal: say your answer out loud, as if you were in the real interview — get your reasoning across clearly first. There is no single correct answer: reading what the interviewer is really after and defending your own thinking is what makes an answer strong.

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