For the last twenty years, the economy of outbound sales has relied on a specific, high-velocity fuel: the third-party lead. The model was simple, efficient, and ubiquitous. A consumer goes to a website like “BestMortgageRates.com” or “https://www.google.com/search?q=CompareInsuranceNow.com.” They enter their phone number to get a quote. Beneath the “Submit” button, there is a tiny block...