Group 1 - The core viewpoint is that building a unified market in China is essential for modernizing the economy, and reducing transaction costs is key to achieving this goal [2][5][6] - Transaction costs are identified as the main barrier to market unification, with administrative divisions and local protectionism being significant contributors [2][5][6] - The concept of a unified market is linked to economic efficiency, emphasizing the importance of specialization and division of labor to enhance productivity [4][5] Group 2 - The article highlights that the transition from a planned economy to a market economy has shifted the role of local governments from direct producers to indirect tax collectors, impacting transaction costs [10] - It suggests that the focus of reducing transaction costs should shift from downstream product markets to upstream factor markets in the context of building a unified market [9][10] - The relationship between central and local governments is crucial in addressing transaction costs, as local governments often create barriers that hinder market integration [8][10]