马克思的投资理论认为，投资的动力主要源于投资者对剩余价值的追逐，从而引发对技术创新与更新机器设备的投资竞争。投资的主要来源是剩余价值，但折旧基金与居民收入也是重要来源，投资的实现不仅取决于与货币资本相对应的剩余产品的有无，更重要的是取决于投资产品的价值能否实现。投资的增长与制度创新息息相关，一方面随着投资的增长，制度特别是企业制度会发生变迁，原因是新制度会带来更多的投资收益；另一方面，新制度的建立，促进了投资的进一步增长。要解决经济增长中的需求约束，关键是要启动企业的投资。而马克思的投资理论，对此具有重要的启发意义 According to Marx’s investment theory, the driving force of investment is mainly the chase of surplus value by investors, which leads to the investment competition of technological innovation and renewal of machinery and equipment. The main source of investment is residual value, but the depreciation fund and residents’ income are also important sources. The realization of investment depends not only on the existence of surplus products corresponding to monetary capital but more importantly on whether the value of investment products can be realized. The growth of investment is closely linked with institutional innovation. On the one hand, as the investment grows, the system, especially the enterprise system, will change. The reason is that the new system will bring more investment returns. On the other hand, the establishment of a new system will promote investment Further growth. The key to resolving the demand constraints in economic growth is to start the business investment. However, Marx’s investment theory is of great significance to this