To give a small example of reality:
A factory relocated to a remote town, in the local recruitment of a large number of workers.
Around this factory, laundry, breakfast, restaurants, hospitals, clothing stores, and other ancillary tertiary industries are slowly driven up.
Factory benefits - workers work in the factory, get a wage, then not satisfied with eating in the cafeteria, will often go to the neighborhood in groups to eat and drink in a variety of small restaurants, and slowly will lead to the development of tertiary industries in the region.
The factories are not doing well - the workers' wages in the factories are not enough to support their extra spending, so they will slowly reduce the number of times they eat out. The many restaurants that survived the boom slowly close down one by one due to reduced patronage, and the other industries around them slowly decline as well.
A little goes a long way
How about the economic development of a region?
Just look at the number of restaurants in the area.
-- Personal opinion.