When did american business begin to concentrate on customer needs why?

American businesses began to be more interested in the needs of their customers due to the increase in the competition between merchants and the demand of quality by the consumer which forced the merchants to pay more attention to consumer needs rather than their own necessities as an entrepreneur, since if the consumer does not need a product, then it is not commercially viable. Since the 1950's the increase in consumption has had a direct impact on entrepreneurs, business owners, and markets.