if you want the punchline, this quora answer has it (SPOILER ALERT): https://www.quora.com/What-is-the-most-useful-Harvard-Business-School-case-for-startups-The

if you want the punchline, this quora answer has it (SPOILER ALERT): https://www.quora.com/What-is-the-most-useful-Harvard-Business-School-case-for-startups-The-case-doesnt-necessarily-need-to-be-about-startups-It-could-bring-out-a-core-pattern-or-abstraction-that-is-useful-for-entrepreneurs https://www.quora.com/What-is-the-most-useful-Harvard-Busine... otherwise you can search for “ODI optical distortion business case” to find sites that have the setup and various attempts at analyzing/answering the case.