In a market you've never seen, a long line does your thinking for you. Strangers waiting at 1 stall become evidence: locals must know something.
That's social proof — when you can't judge directly, nearby behavior becomes your clue.
But crowds can be wrong. A line may reward a good corner, speed, or habit, not taste.
So read the queue, then check what it can't say: cleanliness, a focused menu, food that moves fast.