“Municipal” bonds include bonds issued by states, as well as bonds issued by cities and by many types of smaller entities, such as hospitals and toll roads. To date, everyone has assumed that there is not much risk of default, and even if there is, someone else will handle it. But if one looks at the long term oil situation, and the problems states and cities are having already, it is pretty clear that the debt default problem is likely to get worse over time, and there is really no one set up to handle the default risk.
Think you’re paying too much for local, organic food? Think again.