<Li> The structure typically sits in the middle of a large, paved parking lot . It is meant to be accessed by vehicle, rather than by pedestrians . </Li> <Li> Floor space several times greater than traditional retailers in the sector, providing for a large amount of merchandise; in North America, generally more than 50,000 square feet (4650 m2), sometimes approaching 200,000 square feet (18,600 m2), though varying by sector and market . In countries where space is at a premium, such as the United Kingdom, the relevant numbers are smaller and stores are more likely to have two or more floors . </Li> <P> Commercially, big - box stores can be broken down into two categories: general merchandise (examples include Walmart and Target), and specialty stores (such as Menards, Barnes & Noble, or Best Buy) which specialize in goods within a specific range, such as hardware, books, or consumer electronics respectively . In the late 20th and early 21st centuries, many traditional retailers--such as Tesco and Praktiker opened stores in the big - box - store format in an effort to compete with big - box chains, which are expanding internationally as their home markets reach maturity . </P> <P> Big - box development has at times been opposed by labor unions because the employees of such stores are usually not unionized . Unions such as the United Food and Commercial Workers Local 770 and the Joint Labor Management Committee of the Retail Food Industry have expressed concern about the grocery market because stores such as Kmart, Target, and Walmart now sell groceries . Unions and cities are attempting to use land - use ordinances to restrict these businesses . </P>

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