Which suggests a test for your understanding of a market: can you map out the incentives and explain why what looks like apparently-irrational behavior is happening?
For example, in healthcare, we waste 30%+ of the $3T we spend each year. Much of that waste is due to hospital readmissions for an ongoing condition like heart failure. Startups sometimes try to fix this by developing a special machine learning algorithm to predict readmissions and apply an intervention. But even when the technology succeeds, the business fails: hospitals charge for readmissions, so there's an active disincentive for the hospital to buy the product. (That is now changing with ACOs, and a change in incentives is an opportunity for new companies.)