Today, the majority of company organizations are facing on very fast and dynamic changes in business environment. It is important that companies have faster speed of response on change of market place in business and they are acknowledging the existence of a limit. So, they have been cooperating among the companies through mutual cooperation and the importance of organic response through relationship have increased. This research is not the existing paradigm about transaction cost theory among the companies. We want to know that is accompanying growth factors of between large and small businesses. In this research, a summary of the proposed hypothesis testing are as follows:First, we were confirmed that socialization process have the positive impact on relationship capital and relationship learning. however, the hypothesis that socialization process will have a direct impact on long-term relationship, is not adopted. Second, we were confirmed that relationship-specific investments is the positive impact on relationship capital, relationship learning, and long-term relationship. Finally, we were confirmed that relationship capital and relationship learning are the positive impact on long-term relationship among the companies. In the research, we were confirmed that socialization process theory is the appropriate paradigm for accompanying growth factors of between large and small businesses. Also we could find the theoretical and practical implications from this research.