Discuss the view that if the A / S ratio only measures average levels of spend across an industr

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Step 1: Define the $A / S$ ratio.  
The $A / S$ ratio, which stands for Advertising to Sales rat

Discuss the view that if the $A / S$ ratio only measures average levels of spend across an industry then its relevance may be lost as individual organisations have to adjust levels of promotional spend to match particular niche market conditions.