I’m standing in the basement of a house near Bern’s Bundesplatz and looking at a cockpit made of screens, pointers and scales. They show data about unemployment or inflation. And I, the director of the Swiss National Bank (SNB), am supposed to maneuver my country through the crisis: a volcanic eruption has damaged submarine cables between Europe and North America, supply chains are collapsing, and financial markets are coming under pressure. People are watching the rising prices, fearing for their jobs and storming the shops. In short: there is a risk of a crash. To avert it, I only have one lever: the key interest rate. But what should I do – increase it, lower it or wait?