At this point there will be no investment left to increase the stock of capital per unit of labor. So economic growth will stop. This is shown by the following figure. Continuous improvements in technology is necessary for sustained growth. Education and training add to an individual's human capital.
Human capital plays a major role in labor's productivity.
Just as society needs to set aside resources for the creation of physical capital, society must set aside resources for the development of human capital. While inventions and innovations are necessary for long run growth, the benefits of these are usually enjoyed by many more than the inventors and innovators. It is hence important to ensure that the proper incentives to invent and innovate exist. Appropriate intellectual property rights are essential. The above discussion indicates that economic growth can occur due to growth in the stock of capital per unit of labor and other factors like technological improvements.