On Tax Day, New York City Mayor Zohran Mamdani hosted a public forum with two noted economists, calling for a tax on the “super-rich.”
The same day, the three men—Mamdani, Nobel laureate economist Joseph Stiglitz, and French economist Gabriel Zucman—co-signed a column in British newspaper The Guardian describing inequality as a “global crisis” and demanding that billionaires pay their “fair share.”
The proposal is not new. Zucman, 39, has championed it since 2024, when he advised Brazil’s G20 presidency on a global minimum tax for billionaires. He first rose to prominence in 2019, after Sens. Elizabeth Warren and Bernie Sanders folded his research on tax evasion into their presidential campaigns….