Make me a market on the population of Canada
Asked at Optiver, IMC
Interviewer: "Make me a market on the population of Canada, in millions. I may trade with you in either direction."
Give a bid and an ask, and explain how you chose the width.
Show a hint
First form a point estimate and, just as important, an honest uncertainty around it. Your quote should be a function of both.
Your answer
This one is open-ended. Work it through, then check your reasoning against the full solution.