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Your A/B test has interference between users (marketplace, social network). Why does it bias results and how do you fix it?

Standard A/B math assumes one user's treatment doesn't affect another's outcome. In marketplaces and social networks that assumption breaks and your estimate is biased. The signal is naming SUTVA and the right randomization unit. Here is the answer.

Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.

Standard A/B math assumes one user's treatment doesn't affect another's outcome. In marketplaces and social networks that assumption breaks and your estimate is biased. The signal is naming SUTVA and the right randomization unit. Here is the answer.

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