The article explores ways to reduce the spread of financial crises, like the one caused by the coronavirus pandemic. By analyzing past crises, the researchers found that using a mix of rules and central bank actions can help limit the impact of financial contagion. They identified four main ways that crises spread, like through banks lending to each other or selling off assets quickly. By putting limits on stock trading and giving banks more access to money, the effects of a crisis can be lessened. Additionally, making changes in how banks trade government bonds can also help stop the crisis from spreading.