There are several strategies that can be adopted to increase market entry barriers and restrict competitors by manipulating the supply chain or monopolizing key resources. However, it should be noted that these strategies may raise legal and ethical issues, and certain behaviors may be prohibited by regulations such as antitrust laws. Therefore, the following information is only for understanding business strategies, and it is recommended to consult professional legal advice before taking any action. 1. **Vertical integration**: By controlling the upstream or downstream links of the supply chain, such as raw material supply or distribution channels, you can reduce your dependence on third-party suppliers and thus increase your control over the market. 2. **Signing exclusive supply agreements**: Signing exclusive agreements with key suppliers to ensure that competitors cannot easily obtain raw materials or key components required for production. This can increase the difficulty for competitors to enter the market. 3. **M&A strategy**: Owning key resources or important links in the supply chain through mergers and acquisitions can limit other companies' opportunities to obtain these resources. 4. **Developing own resources**: Investing in developing own key resources to reduce dependence on external supply. At the same time, this control can be used as a lever in negotiations with competitors. 5. **Innovation and patent protection**: Obtaining patents for key technologies through research and development and innovation prohibits other companies from using these technologies without permission. 6. **Optimize supply chain efficiency**: Invest heavily in technology and infrastructure to improve the efficiency and reliability of the supply chain, thereby undercutting competitors on price and delivery speed. 7. **Pricing strategy**: Leverage one's own advantages in the supply chain to squeeze competitors' profit margins through low-price strategies, forcing them to exit the market. 8. **Set technical standards**: Use industry influence to help formulate or promote industry standards that are in line with one's own advantages, making it difficult for competitors to adapt to or reach the standards. When taking the above measures, always pay attention to complying with relevant laws and regulations to avoid violating antitrust laws and damaging fair competition in the market.