The article explores how changes in the way banks borrow money from each other can have a big impact on the economy. By studying European money markets after the 2008 financial crisis, the researchers found that when banks shifted from borrowing without collateral to borrowing with collateral, it had a significant effect on the overall economy. This shift led to banks relying more on central bank funding, especially in countries with weak economies. The study shows that these changes in how banks borrow money can cause major changes in the economy.