"Law Number XXIX: Executives who do not produce successful results hold on to their jobs only about five years. Those who produce effective results hang on about half a decade."

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Never stop testing, and your advertising will never stop improving. Testing was used in advertising decades ago. The internet has made testing so easy that every online marketer can use it to improve advertising results. Google content experiment is a free tool for you to do split testing.

— David Ogilvy