The revelation of the law of diminishing capital returns is that

The law of diminishing returns refers to the decline of marginal output after marginal input exceeds a certain level, which enlightens us that the more input, the smaller the value of return.

Marginal effect is widely used. For example, the law of demand in economics is based on this, that is, the more goods users buy or use, the lower the cost they are willing to pay for the unit goods (because the utility brought by the later purchased goods is reduced). Of course, there are a few exceptions, such as a heavy drinker, the more he drinks, the happier he is, or a stamp collector collects a set of stamps, then the last stamp collected in this set of stamps has the greatest marginal effect.

For example, when we were hungry, we brought you a plate of steamed bread. When you are eating, the first one, even the fifth one, is delicious. Finally, when I am full, I don't want to eat the rest of the steamed bread. I feel that it is not delicious. The good feeling disappeared. That's it, even have a bad feeling. When material consumption reaches a certain level, people begin to get tired of it.

The diminishing marginal benefit is a basic concept of economics. It says that in an enterprise with resources as input, the utility of unit resource input to product output is decreasing. In other words, although its total output is increasing, its second derivative is negative, which slows down its growth rate, making it eventually tend to peak and may decline.

In a sense, marginal effect breaks people's original thinking, that is, the usual "input-output" model.

When it is at a certain "edge", this model fails. Since it is called "marginal effect", that is to say, it can summarize some phenomena in life, not just in the field of economics.

In order to solve the problem of astronauts' writing in weightlessness in space, the United States invested hundreds of millions of yuan and finally developed a special ballpoint pen. The former Soviet Union skillfully solved the problem without investment: let the astronauts take a pencil to the sky. (Of course, this is just a joke story. In fact, this pencil is not an ordinary pencil, but a special pencil. This story is only used to compare some common marginal effects in life. )

If the solution of the problem is regarded as an output, the research and development and time invested in it are all invested.

From the input-output model, the above story shows the figures of "marginal effect".

In the era of rapid development of science and technology, under the policy of rejuvenating the country through science and education, and under the guidance of the theory that science and technology are productive forces, if we enter the thinking mode of "scientism", we will probably hit the south wall of "marginal effect" in the end.

Therefore, science and technology is not the more the better, the higher the better, more importantly, its practicality and pertinence in solving practical problems.