of general merchandise at discounted prices, in formats smaller than today's discount superstores. History United States During the period from the 1950s to the late 1980s, discount stores were more popular than the average supermarket or department store in the United States. There were hundreds of discount stores in operation, with their most successful period occurring during the mid-1960s in the U.S. with discount store chains such as Kmart, Ames, Two Guys, Gibson's Discount Center, E. J. Korvette, Mammoth Mart, Fisher's Big Wheel, Zayre, Bradlees, Caldor, Jamesway, Howard Brothers Discount Stores, Kuhn's-Big K (sold to Walmart in 1981), TG&Y and Woolco (closed in 1983, part sold to Wal-Mart) among others. Walmart, Kmart, and Target all opened their first locations in 1962. Kmart was a venture of S. S. Kresge Company that was a major operator of dime stores. Other retail companies branched out into the discount store business around that time as adjuncts to their older store concepts. As examples, Woolworth opened a Woolco chain (also in 1962); Montgomery Ward opened Jefferson Ward; Chicago-based Jewel launched Turn Style; and Central Indiana-based L. S. Ayres created Ayr-Way. J. C. Penney opened discount stores called Treasure Island or The Treasury, Sheboygan, Wisconsin based H. C. Prange Co. opened a chain of discount stores called Prange Way, and Atlanta-based Rich's owned discount stores called Richway. During the late 1970s and the 1980s, these chains typically were either shut down or sold to a larger competitor. Kmart and Target themselves are examples of adjuncts, although their growth prompted their respective parent companies to abandon their older concepts (the S. S. Kresge five and dime store disappeared, while the Dayton-Hudson Corporation eventually divested itself of its department store holdings and renamed itself Target Corporation). In the United States, discount stores had 42% of overall retail market share in 1987; in 2010, they had 87%. Many of the major discounters now operate "supercenters", which add a full-service grocery store to the traditional format. The Meijer chain in the Midwest consists entirely of supercenters, while Wal-Mart and Target have focused on the format as of the 1990s as a key to their continued growth. Although discount stores and department stores have different retailing goals and different markets, a recent development in retailing is the "discount department store", such as Sears Essentials, which is a combination of the Kmart and Sears formats, after the companies' merger as Sears