The United States population is stratified into three main socioeconomic classes: 15% upper class, 63% middle class, and 22% lower class. Wealth is concentrated at the top, with the richest half percent holding 25% of the nation's wealth and the richest 13% holding over 90% of the wealth, while the poorest half of the population earns only 13% of the country's total income. Income and wages also vary greatly across economic classes, with CEOs making on average over $1,000 per hour compared to the average worker's $16.23 per hour.