The article focuses on the complex and economic evaluation and comparison of selling terms provided by the international on-line sellers. Analysis of scientific literature on electronic commerce (e-commerce) published by Oxford University Press, Cambridge University Press, Harvard University Press, Springer, M. E. Sharpe, Routledge, etc. shows that 15% of the authors analyse only selling terms. Most of these authors investigate selling terms from an economic point of view and others, only about 1, 5 %, from a legal point of view. The authors that analyse selling terms give the same attention to the international and national issues, but more attention to the United States of America than to the European Union issues. So, the results of this analysis show the importance of research, which combines economic and legal terms, and give more attention to the European Union on-line sellers. The paper presents the results of investigations in this context.