It is a popular myth that the sales effect of advertising are too difficult to measure. The pre-condition for successful measurement of the sales effect of advertising are

-variations, over time, in the level of advertising

An econometric model has a single variable that I am trying to explain called dependent variable. This would be the brand volume share, or a retailer's sales called "NET sales". To do this I use a number of explanatory variables, typically the advertising of the brand relative to competitor

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Approximate Word count = 404
Approximate Pages = 2 (250 words per page double spaced)