BBC World Business hears from best-selling French economist Thomas Piketty, and asks Irwin Stelzer whether Piketty's theories on wealth distribution could ever become policy.

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A Mexican National Guard officer stands guard on a pickup truck during a vehicle check heading to the United States at the San Ysidro Port of Entry crossing in Tijuana, Baja California, Mexico, on February 6, 2025. (Getty Images)