How Does Repo: How Roughly $1 Trillion Moves Overnight | WSJ Work?

Imagine you have a giant piggy bank that holds $1 trillion, and every night, it swaps its coins with another piggy bank across town, all in just one night!

Repo is like this giant piggy bank swap. It's how banks borrow money from each other overnight so they can keep their piggy banks full enough to give people cash when they need it.

Think of two friends who both have piggy banks:

• One friend has a lot of coins but needs more space.
• The other has extra room and some spare coins.

So, the first friend gives the second friend a promise (like a IOU) that they'll return the coins in the morning, plus a few extra candies (which are like interest) for helping out.

That’s what happens with banks: one bank borrows money from another, and pays back just a little bit more the next day. This helps them both keep their piggy banks full and ready for the next day's needs.

Every night, billions of these swaps happen, that’s where the $1 trillion comes from! It’s like a big game of musical chairs with money, fast, fun, and happening all over town.