Not all headaches represent migraines, and migraine is not the only condition that can cause severe and debilitating headaches. For example, cluster headaches are very severe headaches that affect one side of the head in a recurrent manner (occurring in a cluster over time).
The United States government is the largest issuer of debt securities, and its bonds are considered the safest fixed-income investments available to your customer.
The United States government has continuously had a fluctuating public debt since its formation in 1789, except for about a year during 1835â1836. To allow comparisons over the years, public debt is often expressed as a ratio to gross domestic product (GDP).