Regional rivals in each of China's 31 provinces make it difficult for foreign retailers, such as Tesco, Carrefour, Metro AG, Home Depot, to scale up and increase market share. Metro AG says it will pull out of China after testing electronics stores for 2 years. After years of losses Home Depot shut down its 7 large stores in China in 2012. Profit margins can be as low as 2%, making it unprofitable without the scale needed. Tesco's market share in China declined to 2.4% of China megastore sales in 2012 from 2.9% in 2008, and Carrefour sales declined to 6.9% from 8.6% in the same period, according to Euromonitor. Tesco now plans to partner with China Resources Holdings to merge its stores with the larger domestic Chinese chain's 4100 stores under 10 retail brands, with Tesco holding 20% of the joint venture. The CR Vanguard brand of China Resources 3000 stores would be merged wih Tesco's 131 stores.