False. There is no Economic Law of Consolidation such as you posit here. Haircuts are a mature market, yet plenty of small providers thrive. Counterexamples to your extraordinary claim abound.
The actual economics in highly competitive markets depend on what is known as the Minimum Efficient Scale, which in turn depends on the shape of the cost function.
The actual economics in highly competitive markets depend on what is known as the Minimum Efficient Scale, which in turn depends on the shape of the cost function.