Most founders set price by feel. They look at a competitor, pick a number that sounds reasonable, and worry it is too high. The Van Westendorp Price Sensitivity Meter, the method Vohra used for Superhuman, replaces that anxiety with data. It is four questions asked of real users, and it returns a range of prices the market will accept rather than a single number you hope is right.
The four questions probe the boundaries of acceptable price. At what price is this so expensive you would not buy it. At what price is it so cheap you would worry about quality. At what price does it start to get expensive, so you would have to think about it. At what price is it a bargain. Asked across a population, the answers cross at points that map the zone where the market is willing to pay.
What makes Vohra's use of the method instructive is the question he anchored on. Before he ran the survey, he settled positioning. Superhuman is the best email tool on the market for high performing teams and individuals, and he had the metrics to back the claim. Positioning at the high end of the market means you do not optimize for the most signups. You optimize for the price a confident buyer will still pay after they think about it. That is question three, not question four.