Currently, the world's 10 richest men own more wealth than the bottom 40% of humanity, or 3.1 billion people.

"It's no accident that we are seeing staggering levels of inequality in the U.S. and globally. It's by deliberate design," Abby Maxman, Oxfam America's president, said in a release.

"For decades, the ultra-wealthy and corporations have used their economic might to pressure those in power to write the rules so they can avoid taxes, pay poverty wages and skirt responsibility," Maxman added. "Meanwhile, working families are feeling the sharp edge of economic insecurity and loss of hope in the future."