Operational strategies for extra waiting-area value-added services: Self-operation, agency, wholesale, or clustering?

• Wentao ZhanHarbin Institute of Technology
• Xuchuan YuanSingapore University of Social Sciences
• Jida LiuHarbin Institute of Technology
• Xue BaiHarbin Institute of Technology
• Jiashen LiZhejiang Wanli University
• Weifeng LiZhejiang Wanli University
• Chencan LinSouth China University of Technology