You have a list of companies and their open roles. You want one number per company: how hard is this company hiring, right now? That number is easy to compute and easy to get wrong in ways that look plausible. Here's a design that survives contact with real data, and the specific mistakes that inflate every naive version. The three inputs Volume. How many roles are open. The most obvious input and the least interesting on its own, because it scales with company size. Ten ope...