Over the past 30 years, U.S. trade negotiators have pressured Japan to open its market to foreign goods and services. These outside pressures, known as gaiatsu in Japan, have been based partly on economically coercive bargaining and partly on invitation. The coercive element, which has entailed threats of retaliatory market constriction should a satisfactory resolution of the market opening dispute not be forthcoming, generally has been a necessary ingredient in obtaining concessions from Japan. The invitational component, which has included requests for U.S. pressures from Japanese interests who favor reforms, generally has facilitated Japanese concessions and made the gaiatsu process unique.