This question evaluates a data scientist's competency in experimental design, metric definition, causal inference, and operational diagnostics related to marketplace supply, safety, and unit economics.

A delivery marketplace is considering a program that allows couriers using bicycles ("biker dashers") to fulfill orders. This could expand supply in dense urban areas and potentially improve customer experience and unit economics, but it may introduce operational and safety considerations.
Assume the marketplace operates across multiple zones/cities with heterogeneous demand, weather, and infrastructure.
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