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But you don’t have to blindly follow the algorithms to get ahead. Consider Paul Graham or Morgan Housel. Both have never spent any time engaging in “growth hacks” or “engagement bait,” yet they are some of the most successful writers on the internet.

The problem was when you’re in hypergrowth like this, you don’t have time to see what is going to happen to the data in the long term. The churn would catch up with you. People would unsubscribe at higher rates, and then, before you know it, the service has just turned into something — if you look at Groupon now, it’s just this vestige of what it o... See more

In summary, dense cities agglomerate critical, often scarce resources that can be shared collectively. Utilizing these shared resources, firms are free to specialize and innovate on their small slice of the pie. This combination of shared resources and specialization is the magic that makes cities so productive.