This advertisement, originally published in Fortune magazine, is clearly not aimed at camera and film consumers, but perhaps more at investors and/or industry leaders. 

The concept for the advertisement comes from George Eastman's comment to a company lieutenant in the early 1900s, "Plant the Brownie acorn, and the Kodak Oak will grow."

Mr. Eastman recognized early on that film, more than cameras, would be a substantial, ongoing revenue source for Eastman Kodak. His Brownie Cameras, at $1.00 and $2.00, revolutionized amateur photography and put cameras in the hands of millions of consumers - consumers who would each put dozens, hundreds, even thousands of rolls of Eastman film through their inexpensive cameras throughout their lives.

"The Growth and Triumph of an Idea" refers no doubt to the success that Eastman Kodak was realizing in the early 1900s as consumers young and old alike snapped up Kodak Brownie cameras and film.