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.
In 2010, the federal tax rate for the bottom quintile of the income distribution was 1.5 per-cent and that for the top quintile was 24.0 percent (see Figure 1). The top 1 percent of all households in the United States had an average federal tax rate of 29.4 percent in 2010.uch of the progressivity of the federal tax system derives from the individual income tax. In 2010, the lowest quintileâs average rate for the individual income tax was -9.2 percent and the second income quintileâs rate was -2.3 percent (see Figure 6 and see Table 2 on page 9).