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Greenleafable
People started realizing that they could stimulate demand and make people want to buy things even though they might not think of them or might not need them. They figured how to use people's psychology against them, and the media was helpful because the media would also earn from this due to ads. This industry seriously began developing in the second half of the 19th century.
saadhussain514
The Creation of big producing corporations within us pushed retailers to expand in size furthermore encouraged the growth of the advertising industry.

Explanation:
The advertising businesses that the world business of public relation and selling corporations, media services, and advertising agencies mostly controlled these days by simply many international holding corporations.