It is easier to assess the communication effect of advertising than the sales effect. Many firms try to measure the effectiveness of advertising in terms of sales results but this practice is always misleading. Since, the effect is the result of so many variables, a distinct effect of advertising on sales cannot be correctly measured, Although there may be some exceptions. For example direct mail advertising can effectively be measured by the inquiries received. But in many situations the exact relationship between advertising activity and sales cannot be established satisfactorily.
We can correctly assume that some sales will occur even though there is no advertising or little advertising or conversely there will be no increase in sales after the point of saturation is reached or it may be that sales will show a decreasing trend at this point in spite of large amount of expenditure on advertising is done. It is so because advertising is no the only variable that effect the sales.
Thus, we may conduct that sales effect of advertising is difficult to measure because a number of variables affect the quantum of tales and the contribution of advertisement cannot be measured separately unless all other variables are presumed to be constant. This situation is quite hypothetical and almost nonexistent. Added to this is the fact that advertisement itself is made of a variety of variables such as media, messages, colours, page or time of the day, locations, the size of the headline and the appeals used. Thus even if the advertising variable is separated this would still not answer the question about the effectiveness of the individual components of the advertising campaign. So advertisers try to measure the communication effect of the advertising.
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