Mathematician Spencer Greenberg read Curbed's handy guide to tipping your doorman, super, handyman, et al., and observed the following: "It includes really wide ranges (e.g. $25-$150 for doormen). I ...

You're currently following this author! Want to unfollow? Unsubscribe via the link in your email. Follow Andy Kiersz Every time Andy publishes a story, you’ll get an alert straight to your inbox!

In theory, tipping should be simple. If you receive excellent service, it's easy to reach into your wallet and offer a tip. But in recent years, as people carry less cash and increasingly depend on ...