(Bloomberg) -- Lynn Forester de Rothschild is exploring a sale of a significant minority stake in The Economist Group, marking the first ownership shake-up in a decade at the 182-year-old magazine read by both the political and business elite. A sale process for around 20% in voting shares could kick off in the coming weeks and fetch about £200 million ($271 million) to £400 million, according to people familiar with the matter, who asked not to be identified because discussions are private. Forester de R ...