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The textbook traces the evolution of the advertising agency model:
- Pre-1880: Advertising agents were simply middlemen who bought space from newspapers and resold it to advertisers at a profit
- ~1880: N. W. Ayer and Son of Philadelphia introduced the “open contract” β they would be the advertiser's sole agent and price ad space at cost plus a fixed commission. This eliminated price competition among agencies
- By 1892: Ayer hired the first full-time copywriter; other agencies followed
- 1893: The American Newspaper Publishers Association agreed not to offer discounts to direct advertisers, forcing all advertisers to use agents
- 1901: Curtis Publishing Company (Ladies' Home Journal) adopted the same practice; magazines followed
- 1919: The cost-plus-commission basis was accepted industry-wide, with the commission standardised at 15 percent β a rate that remained the industry standard for decades
This transformation turned advertising agencies into creative service providers (writing copy, creating logos and slogans, managing artwork) rather than mere space brokers.
In the $xy$-plane, line $k$ has equation $3x - 2y = 0$. Compare:
Quantity A: The $x$-intercept of line $k$
Quantity B: The $y$-intercept of line $k$
Find the intercepts of $3x - 2y = 0$:
x-intercept (set $y = 0$): $3x = 0 \Rightarrow x = 0$.
y-intercept (set $x = 0$): $-2y = 0 \Rightarrow y = 0$.
Both intercepts are $0$ (the line passes through the origin).
Quantity A $= 0 =$ Quantity B. The two quantities are equal.
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