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.
Taxes per capita in the United States totaled $13,482, according to the OECD data. That ranked 16th out of 29 countries for which data were available for 2013. The five with the highest per-capita amounts were Luxembourg, Norway, Denmark, Sweden and Switzerland, with amounts ranging from $23,000 to $48,000.