NEW YORK ( TheStreet) -- With weak third-quarter results coming out from Yum! Brands ( YUM) and Coca-Cola ( KO), McDonald's ( MCD) investors are chewing their nails, anxiously anticipating what the fast-food giant will say on Monday. I wouldn't put too much emphasis on the company's quarter-to-quarter performance though.First and foremost, the struggles of the entire consumer discretionary space are nothing new. Even the so-called "recession-proof" stocks like Wal-Mart ( WMT) have been hurt by weak same-store sales and reduced traffic. I don't believe there has been anything to suggest that these concerns will be immediately reversed as a result of the recent government shutdown. For McDonald's, whose Golden Arches have long been the gold standard in the U.S. quick-service space, weak margins and sluggishness in China have taken a toll on the company's recent performance.