Group 1 - The rise of duck roll specialty stores in cities like Beijing, Shenzhen, and Nanjing offers affordable options for consumers, with prices typically under 20 yuan per roll [1][5] - These stores focus on a simple menu featuring duck rolls, complemented by other items like pork rolls and drinks, catering to a consumer trend towards affordable dining [5][7] - The rapid expansion of these stores is supported by a mature supply chain that provides necessary ingredients like duck, pancakes, and sauces [7][8] Group 2 - The duck industry supply chain is well-established, with key players like Jinxing Duck Industry and Dongfeng Breeding providing semi-finished duck products to restaurants [10][12] - Jinxing Duck Industry, part of Beijing Shounong Food Group, processes around 10 million ducks annually and supplies to well-known brands [10][12] - Other suppliers like Huayou Group and Lichuan Food focus on various duck products and solutions for restaurants, enhancing operational efficiency [12][13] Group 3 - The quality of duck pancakes, which are essential for enhancing the flavor of duck rolls, is crucial, with suppliers like Li Quan Hong Da specializing in pancake production [14][17] - Sauce quality also significantly impacts the overall taste of duck rolls, with companies like Yidiao Long producing a variety of sauces tailored for duck dishes [18][20] - Major condiment brands are also developing sauces specifically for duck, indicating a growing market for complementary products [20]