A key advertising objective, particularly for a new product, is to persuade consumers to try the brand. Research solutions for pre-testing and post-testing advertisements accordingly incorporate measures for the persuasiveness of advertising.
For online campaigns, which aim to drive ecommerce, web analytics can provide hard measures such as conversion rates. These figures, however, tend to be extremely low.
In this context, it is important to remember that an ad’s impression influences a prospect in many different ways, and at different times. Conventional research metrics based on pre/post disposition to purchase the advertised brand often provide a better assessment of the persuasiveness of an ad.
Market research companies like Ipsos ASI, use controlled tests to gauge the persuasiveness of advertising. Prior to watching the test ad, respondents are asked what brand they are likely to purchase on their next purchase occasion. Post exposure, respondents are asked what brand they would prefer to win. Asking for the respondent’s preference in a different context helps to mask the purpose of the question. This lessens the possible bias that could arise if respondents knew the intent of the question.
An alternative approach is to use two groups — a test group exposed to the ad and a control group not exposed to the ad. This approach which eliminates bias, requires two well-matched sample groups, and is therefore more expensive.
The persuasion score is the shift between the purchase intent and purchase frequency after seeing the test ad and before being exposed to it, or the difference between the test and the control groups. Ipsos ASI computes a benchmark expected persuasion score called Predicted Average Result (PAR) Shift based on market, brand strength, category loyalty and market fragmentation. A persuasion index is computed based on persuasion score divided by the PAR shift.
In a post-testing scenario, in addition to pre/post disposition to purchase, measures of sales response may also be used to gauge the impact of the advertisement in generating short term sales. This is not straightforward because the impact of advertising on sales is usually drowned by causal influences such as in-store promotions. Market response modelling, which is covered in chapter Market Mix Modelling can help decompose the impact of each of the individual elements, and is particularly useful in assessing short term influences of advertising.
Disaggregate level consumer panel data is quite revealing, in that it can separate trial from repeat purchase. The chart in Exhibit 23.8 reveals a 10% point lift in trial of a brand due to the impact of an ad campaign in December, as well as other marketing activities. This is a good measure for the persuasiveness of the overall marketing effort in attracting new consumers. However, unless we decompose the impact of each of the marketing elements, we cannot deduce how much of this impact is due to advertising alone.
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Marketing has changed. More so in practical terms, and marketing education is lagging.
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