The stock market is an indirect way of measuring the popularity of different companies. If people think a company is valuable, its stock price goes up. If people think a company isn’t worth much, its stock price goes down.
Now Purina wants to offer a stock market for cat videos. The idea is that people can vote on their favorite cat videos so everyone can see which videos seem the most popular and which ones seem briefly popular like a fad. Dubbed Catdaq, this cat video stock market will help everyone place a value on the best cat videos on the Internet.