The declining population size of many developed countries could seriously harm their economic growth. However, those promoting immigration will rule the roost.
I see some logic in what you say. As the population growth stagnates or falls, economic growth takes a dip.
To a certain extent I agree!!! The decline in population growth is quiet evident in countries like japan, korea reaching TFR 0.9 which could see it's economy facing a structural slowdown that might put a permanent brake on growth. However, countries with very large population or increasing population are also facing economic slowdown. Developed countries are concerned about their declining TFR (Korea, France etc.), and developing nations are still reducing (India, Africa etc.). There's no concept of country with perfect population size to keep the economy growing. Another crucial aspect is that economical growth is dependent upon technological progress but as well known that technology can be a substitute but not a complete alternative .
The answer is no. Economic growth depends on population, to the extent that the size of the labour force and that of private consumption depend on the size of the population. But an important part of economic growth has come from an increase in labour productivity. This arises not just from individual labour productivity, but would also result from people moving into other work and sectors where they are more productive. In addition, people are living longer, and are healthier, and thus could produce more if they wished or had to. Work hours in W Europe and the USA have dropped from 70-80/week to less than 40/week from 1870, while production and income per person have gone up substantially. That, currently, people do not work longer or retire later is for a part a choice they make, between work and leisure. How economic growth is measured may well (have to) change too. For a broader view of well-being cf. Steven Pinker's "Enlightenment Now."
I quite agree with Jaap van der Straaten . I only wanted to add to that the concept of Solow residual, where he mentions that the portion of an economy’s output growth cannot be solely attributed to the accumulation of capital and labour, the factor productivity. It is a measure of growth that is referred to as the Total Factor Productivity (TFP).
I will not talk about the impact of innovation and technological development or talk about the Solow residual, because it was adopted in answer to this important question. What happens if the population growth stoped or regresses as is happening now in the population pyramid of developed countries, of course, the average age of the population will increase a lot, but The societies of these countries will be distinguished by being aging and the proportion of young people will be small compared to the population, this is a very important thing for young extremism, not like old age. the economic growth will be at the Modest state at 2% or less, but it won't stop.
These countries will reach a state of stability state in economic growth
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