For a long time, the conventional wisdom has been that the luxury market was largely impervious to the ups and down of the economy. Yet recent results suggest otherwise and even with an improving macro-economic picture and booming stock market, most U.S.-based luxury retail brands continue to struggle. Just this past Friday, reports surfaced that Neiman Marcus was looking to restructure its debt after a series of disappointing quarters. While Neiman Marcus faces unique challenges owing to high leverage from its 2013 buyout and a botched systems implementation, they are also being hit by a general malaise affecting the sector. HBC’s Saks Fifth Avenue division revenues have stalled during the past year. Nordstrom, which was once a shining star in the retail pantheon, has seen five straight quarters of declines in its full-line stores. Tiffany and Kors are among other brands facing similar declines. So what’s going on here? The most common explanations for faltering performance have been the strong dollar’s impact on foreign tourism and a weak oil market. To be sure, these factors have not been helpful. But the problems in the luxury market go deeper, particularly among the department store players. Even an improvement in foreign tourism or the oil market are unlikely to return the sector to its former glory. Read more at Forbes.