The original version of this story appeared in Quanta Magazine. Imagine a town with two widget merchants. Customers prefer cheaper widgets, so the merchants must compete to set the lowest price.

If you purchase an independently reviewed product or service through a link on our website, SheKnows may receive an affiliate commission. The cooking classes are all priced differently. Some have low ...

Getting good at LeetCode Java can feel like a puzzle sometimes, right? You see all these problems, and you’re not sure where ...