The two political parties expected to form the next German government have agreed to loosen the country's constitution restrictions on borrowing, enabling 1 trillion euros ($1.08 trillion) or more in spending on defense and infrastructure. It’s a major change in Germany’s debt-averse political culture, rejecting conventional economic wisdom that long dominated Europe’s biggest economy and one of the world’s wealthiest countries. Here are key facts about the debt brake and what the changes will mean for Germany and Europe.