Jennifer Lee adds to the discussion noting the particular niches and types of business immigrant groups enter. She notes that it is most common for immigrants to participate in long hours of physically demanding work in the retail industry. The retail market is a viable option due to the relatively low startup costs and knowledge of the host country's language required. Different niches have different levels of communication, for example the retail and self-service niche, (fruit and vegetable markets, take out restaurants) typically require the lowest level of customer interaction and communication. Lee notes the embeddedness of ethnic enclaves and brings the thought that such practices are good for those within the enclave but harmful to certain groups outside them. She also notes the adverse effects patterns of ethnic embeddedness can have on surrounding ethnic groups by noting the difficulty other groups face in joining the network. She argues that this type of retail niche domination can have positive consequences for co-ethnics, as Portes and Wilson believe, however can also have negative effects on surrounding ethnic groups who face exclusion due solely to their ethnic dissimilarity from the network.