The development of new charts and graphics have played an important part in explaining growing income inequality over the past 15 years, says New Yorker columnist John Cassidy.

Read: Canadian poverty measurements flawed

Behind many of the charts is French economist Thomas Piketty. His work has made it possible to identify the top 1% of the richest people in the world, which galvanized the Occupy Movement.

They also show how the concentration of wealth has changed over the years, and when it has reached—and exceeded—dangerous pre-crash levels.

See the charts, and explanations, here.

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