Cause. Hives can also be classified by the purported causative agent. Many different substances in the environment may cause hives, including medications, food and physical agents. In perhaps more than 50% of people with chronic hives of unknown cause, it is due to an autoimmune reaction. Medications
The average American pays almost 30% of their income to taxes. Here's the breakdown. According to the IRS's preliminary data from the 2015 tax year (the returns you filed during 2016), there was a total of $1.454 trillion in income tax owed, which translates to an average effective federal income tax rate of about 13.5% per return.
From 1979 to 2007 the average federal income tax rate fell 110% for the second lowest quintile, 56% for the middle quintile, 39% for the fourth quintile, 8% for the highest quintile, and 15% for the top 1%, with the bottom quintile moving from a tax rate of zero to negative liability. The highest marginal tax rate for individuals for U.S. federal income tax purposes for tax years 1952 and 1953 was 92%. 2  Since 1964, the threshold for paying top income tax rate has generally been between $200,000 and $400,000.