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글의 흐름으로 보아 주어진 문장이 들어가기에 가장 적절한 곳은?
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Interchangeability and mass-production are the two basic manufacturing techniques that were combined for the first time by the automobile industry and they are the real reasons that the average wage-earner today can afford to own a car.
It is easy to see how the automobile industry has created thousands of job opportunities and contributed immeasurably to our higher standard of living, but we are apt to overlook the underlying factor that made all this possible. (①) It was more than just an accumulation of invention on internal combustion engines, and pneumatic tires, and electrical headlights. (②) Without them, every single car would have to be laboriously built by hand and their cost would be so great that only the wealthy could pay the price. (③) But by concentrating a workman's talents on turning out thousands of units all exactly alike and through the use of power and special tools, cars can be and are built by the millions. (④) And since these techniques of interchangeability and mass-production require fewer man-hours to make each item, workers can produce more, thereby earning more, and at the same time the price can be brought within the reach of millions of customers.

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