Go ahead and make "Where's the beef?" jokes, because everyone else has. Some Wendy's restaurants in the U.S. are out of beef amid the coronavirus pandemic, as many meat processing plants have temporarily closed in recent weeks because of outbreaks of the virus among its workers. The financial firm Stephens estimated that about 18 percent of Wendy's locations in the U.S. aren't selling burgers because they ran out of beef, based on an analysis of their online menus. Wendy's is particularly vulnerable to a meat shortage because it uses fresh beef.