Until now we have different accounting or financial reporting systems in different countries. This may be detrimental for capital market participants with worldwide activities who expect advantages in the application of only one system. The use of one system may provide network effects. If they exist, the benefits for users increase the more users adopt the same system. When accounting systems compete in terms of network effects, the decisions for using a system are interdependent and can be modeled by means of game theory. This book analyses how network effects in terms of accounting systems can be defined, how those effects may affect investors, corporations and standard setters, how adoption patterns of accounting systems may be modeled and what drives adoption decisions.