This book outlines the changes in the patterns of bilateral shipping and trade between Finland and Sweden from the late nineteenth century to the present day. The convergence of per capita income and economic structure between the Finnish and Swedish economies together with technological advances and greater political cooperation in the post World War II period has led to the development of closer maritime commercial relations between the two countries. In particular, since the 1960s the development of ferry services between the two countries has been significantly influenced by the growth of tourism as well as the expansion of commercial freight traffic. In addition, the studies on bi-lateral trade shows that the transformation of production seen in Finland and Sweden meant that the trade increasingly became dependent on an exchange of products arising from matching industries. This growing commodity trade togheter with intensified service exchange contributed to strengthen the economic ties between Sweden and Finland during the post-war period.