Authors:

Let advertisers spend the same amount of money improving their product that they do on advertising and they wouldn't have to advertise it.

Will Rogers, Bryan B. Sterling (1995). “Will Rogers Speaks: Over 1,000 Timeless Quotations for Public Speakers (writers, Politicians, Comedians, Browsers ...)”, M Evans & Company
Let advertisers spend the same amount of money improving their product that they do on advertising and they wouldn't have to advertise it.