Little's law

Okay kiddo, Little's law is like trying to figure out how many people can be in a store at one time. Imagine you have a store and you want to make sure nobody gets stuck waiting in line for too long. Little's law helps you figure out how many people can be in the store at one time without making the line too long.

You know that people are going in and out of the store all the time, so you need to figure out how fast they're going in and out. Let's call that the "throughput." The throughput is like how quickly the people can go through the store.

Next, you need to know how many people are in the store on average. It's kind of like counting the number of toys you have in your toy box. Let's call that the "inventory."

Finally, you need to know how long people are spending in the store on average. It's like timing how long it takes you to brush your teeth. Let's call that the "turnover time."

So, Little's law says that the inventory equals the throughput times the turnover time. That means that if you want to have a shorter line, you can either increase the throughput (make people move through the store faster), reduce the turnover time (make people spend less time in the store), or both!

Basically, Little's law helps you figure out how many people can be in the store without making the line too long. You can use it to make sure you have enough cashiers or to figure out how long it will take for everyone to get through the store.