Your question is Choose Randomization for Marketplace Test. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
You work on a two-sided marketplace where changes on one side can affect outcomes on the other. Your team wants to test a new marketplace policy, but there is concern that the way you randomize could contaminate results.
How would you choose the unit of randomization for this marketplace experiment, and why? What trade-offs would you consider between statistical validity, interference, and practical execution?