The purpose of this study was to make an international comparison of business-to-business relationships in Finland, Norway, and Sweden. The focus is on testing: a) the validity and reliability of whether trust and commitment have a positive association with satisfaction; b) whether satisfaction has a positive association with the outputs of specific investments, opportunism, and formalisation. This international study consisted of 1,500 companies. The Finnish, Norwegian, and Swedish sampling frame each consisted of the 500 largest companies, based upon revenue, across multiple industries. The response rate was 38%. Based on the tested model, it was validated that: a) the most solid positive relation is between trust and satisfaction; b) the most solid negative relation is between satisfaction and opportunism. The study indicates that companies should focus on and strive toward solid satisfaction in business relationships to reduce the risk of business partners becoming opportunistic. The study validates previous research comparing cross-country inputs and outputs of satisfaction in business relationships. Copyright © 2013 Inderscience Enterprises Ltd.