An exclusive distribution channel is one that is difficult for outsiders to access. For example, it is often difficult for a new firm to get access to shelf space in supermarkets. This occurs because retailers tend to prefer to carry the products of established manufacturers of foodstuffs with national reputations rather than gamble on the products of unknown firms. The exclusivity of a distribution system varies among countries. Japan's system is often held up as an example of a very exclusive system. In Japan, relationships among manufacturers, wholesalers, and retailers often go back decades. Many of these relationships are based on the understanding that distributors will not carry the products of competing firms. In return, the distributors are guaranteed an attractive markup by the manufacturer. As many U.S. and European manufacturers have learned, the close ties that result from this arrangement can make access to the Japanese market difficult. However, it is possible to break into the Japanese market with a new consumer product. Procter & Gamble did during the 1990s with its Joy brand of dish soap. P&G was able to overcome a tradition of exclusivity for two reasons. First, after two decades of lackluster economic performance, Japan is changing. In their search for profits, retailers are far more willing than they have been historically to violate the old norms of exclusivity. Second, P&G has been in Japan long enough and has a broad enough portfolio of consumer products to give it considerable leverage with distributors, enabling it to push new products out through the distribution channel.