JEFFREY SONNENFELD is having what he calls a Marshall McLuhan moment—“15 minutes of prominence soon to subside back into obscurity”. That is because, not long after Vladimir Putin sent his troops into Ukraine on February 24th, the 68-year-old professor at the Yale School of Management drew up a list of firms withdrawing from Russia, helping catalyse a stampede out of the country—470 businesses have closed or cut back operations. His campaign has generated positive media reviews. It has also put him under siege from public-relations types trying to ensure that the companies they represent do not fall into his “hall of shame”.
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