In the immediate aftermath of the war, from 1918 to 1920, with advertising redeemed in the public eye and private consumption once again rising, American and European business began to spend wildly on advertising, doubling industry revenue in just two years. By 1930, that spending had increased by a factor of ten; and in the process a truly international industry was born, as the profits and powers derived from using access to the public mind became clear, once and for all.

Tim Wu, The Attention Merchants, loc. 177