Market-sizing estimate of Xiaomi's handset units sold per day

Estimate how many mobile phones Xiaomi sells in a single day. Show how you structure the estimate, label every assumption, and finish with a number and a range you would defend. ```hint Turn a stock into a flow Decide whether to work top-down from all phones bought worldwide and Xiaomi's slice of them, or market by market, and be explicit about what converts the number of phones people own into the number bought each year. ``` ### Clarifying Questions - Worldwide, or a single market such as mainland China or India? - Does "sold" mean units Xiaomi ships to carriers and retailers, or units bought by end customers? - Do the Redmi and POCO sub-brands count, and are feature phones or refurbished units included? - An average day across the year, or a particular day such as a launch or a large online shopping festival? ### What a Strong Answer Covers - A settled scope: geography, which brands and devices count, and what "sold" means - A top-line equation linking phone demand and Xiaomi's position in it to units per day - Labeled, round assumptions, each with a reason grounded in how people buy and replace phones in different markets - Correct, unit-consistent arithmetic, including the conversion from a year to a day - A cross-check from a second angle and a final range driven by the least certain inputs ### Follow-up Questions - Which assumption moves your answer the most, and how would you narrow it? - How would the number change on a major shopping-festival day, and how would you estimate that peak? - What public data would you use to check your estimate?