If you upgrade the efficiency of your corporation, it will produce the same quantity of products but with a smaller number of employees. This will reduce salary costs and increase profits. There is also a negative side. Upgrades cost money and the corporation needs more high-tech services. The number of low-level workers goes down but the corporation needs several more high-level workers and executives. If these are not available, you must update your education priorities or if you are a CEO, discuss this with the president of the country. Efficiency upgrades do make sense also for the country as it will make it possible to build more corporations. If education allows, upgrade your corporations as many times as your finances allow. In the long run, they will become very profitable.