Have you heard of Javier Milei? He’s the president of Argentina, about to wrap up his first and very consequential year in office. Howard LaFranchi visited Buenos Aires recently and took stock of Mr. Milei’s no-holds-barred drive to radically reorganize the government and reimagine a boom-and-bust, hyperinflation-riddled economy. His often painful pursuit of wrenching change is thrilling some; others reject his rough talk and divisive measures.

It’s a major revolution led by a brash economist and former lead singer in a Rolling Stones cover band. One observer notes that Mr. Milei believes he’s going to save the West with his model. See what you think.