Considering the effect of the declining population, the declining population can cause people to change jobs or move to new areas because "their existing jobs, business, or industries would also fold up or cease to exist."
This is because every business, company, or industry thrives on the availability of markets.
Here the market means the number of consumers willing to buy a product or service.
However, with a declining population, there is a lesser market for businesses, companies, or firms, to thrive. Subsequently, these firms then decide to move to a place where there is a market, thereby making the employees or people change jobs or move to new areas.
Hence, in this case, it is concluded that the population determines the markets,
which also determines the availability of jobs.
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