Letting Wal-Mart enter Indian retail trade could harm the government's efforts to promote economic integration, says UNI in a letter to Prime Minister Manmohan Singh. An arrival of Wal-Mart could in fact confirm the fears that opening up the retail market could have negative repercussions on workers and local competitors, particularly small and medium sized enterprises. [also refers to Metro, Ahold, Carrefour, Tesco]