This paper suggests a computational model which investigates the sustainability of MMORPGs from the social distance perspective by considering the major differences of the virtual world in an MMORPG and the real world. The effects of social distance on the actual playtime are empirically tested....

Recently third parties provide advertisement-removal services for digital contents, threatening the two-sided market business model of copyright holders. This paper suggests a modified version of the two-sided market model that allows a third party to actively de-embed advertisements from the...