Research on the dynamic running mechanism of search ads platform based on two-sided market theory 并列题名：Research on the dynamic running mechanism of search ads platform based on two-sided market theory Access mechanisms of retail platform based on two-sided market theory 并列题名：Access mechanisms of retail platform based on two-sided market theory Research on the operating mechanism of brand governance based on theories of stakeholder Research on the value co-creation mechanism of internet crowd creation platform based on new social network embedding Research on the contagion mechanism of interbank systemic risk based on complex network theory