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.
The worldwide average top corporate income tax rate (accounting for 173 countries and tax jurisdictions) is 22.9 percent, 29.8 percent weighted by GDP. By region, Europe has the lowest average corporate tax rate at 18.7 percent (26.1 percent weighted by GDP). Africa has the highest simple average at 28.77 percent. Larger, more industrialized countries tend to have higher corporate income tax rates than developing countries.