France’s new 75 percent income tax on the rich may not be popular with millionaires. But it’s being cheered by another group: Paris real-estate buyers. Real estate agents say that the number of multimillion-dollar real-estate listings in Paris has jumped more than 25 percent over last year – due in part to the threat of the new income tax. More than 400 new listings have come onto the luxury real-estate market over the past six months, they say.