The article explores how changes in the way banks borrow money from each other can impact the overall 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 big effect on the economy. This shift led to banks relying more on central bank funding, especially in countries with weak economies. The study shows that this change in borrowing behavior during crises can have a significant impact on the economy.