Your question is Measure Referral Loop Success. 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're working on a product with a built-in referral flow and want to know whether the loop is actually creating durable growth. The team wants a metric view that captures both the immediate sharing behavior and whether referred users become valuable, retained users over time.
How would you measure the success of a referral or virality loop?