Yale Fox’s business doesn’t work unless everyone thinks its fair. His startup, Rentlogic, relies on an algorithm to score New York City landlords on how well they take care of their properties. It’s an easy way for tenants to avoid bedbugs and mold, and for landlords to signal they take good care of their properties. But it isn’t enough for Rentlogic’s score to just exist; Fox needs landlords and tenants to believe in it.