What are your marriage KPIs? Sorry, key performance indicators, that is. You know, the signs that demonstrate the success of your relationship.

No? Not a thing? Well, apparently they should be a thing. That at least seems to be the thinking of Jack Ma, founder of Alibaba's tech giant and one of China's wealthiest men. In a lighthearted speech at an event at which dozens of Alibaba couples were married in a group ceremony, he said: "The first KPI of marriage is to have results.

He also stressed that a balanced home life is important for long-term happiness and health. His prescription for how …