Question: Kurt Jetta has studied data about which chain of discount variety stores?

Context paragraphs:
Deals: Deals (previously stylized as DEAL$) was an American chain of discount variety stores owned by Dollar Tree.  The chain operated more than 194 stores located in shopping centers, malls (until 2015), and urban areas in 19 states throughout the United States.

Crazy Clark's: Crazy Clark's Discount Variety Store was an Australian company that operated over 150 discount Variety stores in its chain, across Queensland, New South Wales, Northern Territory and Western Australia.  The company also owned and operated a chain store called Go-Lo.  Crazy Clark's sold clothing, cosmetics, toys, homewares, electronics goods, gardenware, confectionery and more.  Crazy Clark's was the worldwide trademark owner of the Crazy Clark's logo and name with respect to retail stores.  It was a subsidiary of the Discount Superstores Group.

Dollar Tree: Dollar Tree, Inc. is an American chain of discount variety stores that sells items for $1 or less.  Headquartered in Chesapeake, Virginia, it is a Fortune 500 company and operates 13,600 stores throughout the 48 contiguous U.S. states and Canada.  Its stores are supported by a nationwide logistics network of eleven distribution centers.  The company operates one-dollar stores under the names of Dollar Tree and Dollar Bills.  The company also operates a multi-price-point variety chain under Family Dollar.

Go-Lo: Go-Lo was a chain of Australian discount variety stores with hundreds of stores throughout Australia.  It was part of the largest discount retailer group in Australia.  It was owned by Jan Cameron's Retail Adventures along with Sam's Warehouse, Crazy Clark's and Chickenfeed stores.  The company was sold by Miller's retail to Australian discount retail in 2005.  The chain's parent company, Australian Discount Retail, went into receivership in January 2009 after owing $201 million to creditors.  Recently the company and the other 3 chains of stores owned by Australian Discount Retail have been bought by Jan Cameron under the company name Retail Adventures.

Metropolitan Stores: Metropolitan Stores of Canada Ltd. (often referred to as The Met, Met Stores or Metropolitan) was a former Canadian chain of variety stores based in Winnipeg, Manitoba.  The Metropolitan Stores chain was founded in 1920 and also operated junior department and clothing stores under the SAAN, Greenberg and Red Apple banners.  At its peak, Metropolitan was one of the four largest variety chain store organizations in Canada with 180 stores in all the provinces and territories.  In French, the chain was known as le Met and Metropolitaine.

Discount Superstores Group: DSG Holdings Australia Pty Ltd, trading as Discount Superstores Group was a discount variety retailer in Australia, formed in 2013 following the liquidation of former company Retail Adventures.  It owned the Sam's Warehouse and Crazy Clark's brands, operating 143 stores.  It is owned by Australian-New Zealand businesswoman Jan Cameron.  It was announced on 1 July 2014 that the chain has entered receivership for the fourth time in 8 years.

The Reject Shop: The Reject Shop is an Australian discount variety store chain.  Founded in 1981 as a "seconds" store in South Yarra, the company currently operates over 340 stores Australia-wide.  The Reject Shop employs over 5,600 staff.  The group replaced the majority of Chickenfeed (Retail Chain) stores in Tasmania, and took up the space that was left when Retail Adventures closed down

Kurt Jetta: Kurt Jetta (born 21 July 1961) is a consumer researcher who studies data about multinational corporations through his firm, TABS Analytics, which is based in Shelton, Connecticut.  The corporations Jetta has analyzed include Family Dollar, Dollar Tree, Walmart, Apple, Kmart, JcPenney, and Sears.  In addition, Jetta has also studied the organic food industry, as well as the vitamin industry.  Other investigations led by Jetta include sociological research that pertains to the purchasing habits of various ethnic groups.  In the area of trade promotion, Jetta has developed an alternative methodology to current industry baseline models.  Jetta also analyzes rewards programs.

Gamble-Skogmo: Gamble-Skogmo Inc. was a conglomerate of retail chains and other businesses that was headquartered in St. Louis Park, Minnesota.  Business operated or franchised by Gamble-Skogmo included Gambles hardware and auto supply stores, Woman's World and Mode O'Day clothing stores, J.M. McDonald department stores, Leath Furniture stores, Tempo and Buckeye Mart Discount Stores, Howard's Brandiscount Department Stores, Rasco Variety Stores, Sarco Outlet Stores, Toy World, Rasco-Tempo, Red Owl Grocery, Snyder Drug and the Aldens mail-order company.  In Canada, retail operations consisted of Macleods Hardware, based in Winnipeg, MB, and Stedmans Department Stores, based in Toronto.  Gamble-Skogmo carried a line of home appliances, including radios, televisions, refrigerators, and freezers, under the Coronado brand name.

Discount store: A discount store is a retail store which sells products at prices that are lower than the typical market value.  A "full-line discount store" or "mass merchandiser" may offer a wide assortment of goods with a focus on price rather than service, display, or wide choice - such as Aldi and Lidl; a "speciality", "single line", or "category killer" discount store may specialize in specific merchandise such as jewelry, electronic equipment, or electrical appliances, relying on bulk purchase and efficient distribution to keep down cost - such as Toys "R" Us and Staples.  Discount stores are not variety stores, which sell goods at a single price-point or multiples thereof (£1, $2, etc.).  Discount stores differ from variety stores in that they sell many name-brand products, and because of the wide price range of the items offered.  Following World War II, a number of retail establishments in the U.S. began to pursue a high-volume, low-profit-margin strategy designed to attract price-conscious consumers.  This strategy has received renewed interest from retailers and customers alike stemming from the Great Recession that began in 2007 that forced buyers to revisit the approach to the products they wanted.

Supporting paragraphs: Kurt Jetta Dollar Tree
Answer: Dollar Tree, Inc.