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Internet advertising was supposed to make it easier for marketers to measure the impact of their ad buys. But a basic question remains: Which influences customers more — search ads or display ads? 

The dirty little secret of advertising agencies is that much of their work is pure guesswork. Companies spread out their advertising budgets across channels—a little bit of TV, some print media, a few billboards—and wait for customers to roll in. In very few cases, however, do they know if or how these investments motivated consumers to plunk down their credit cards or fill out an application for a service.

That’s why the Internet has been such a godsend to companies, says Sunil Gupta, the Edward W. Carter Professor of Business Administration at Harvard BusinessSchool. Finally, by measuring a few clicks of a mouse, companies can tell how successful a  particular ad was in making a purchase decision. “A lot of companies have put more and more money into online marketing because online marketing is more measurable, as opposed to television where you put in millions of dollars and you have no idea what you get for it,” says Gupta.

When you really start to examine how online advertising works, however, that return on investment may not be quite so easy to calculate. After all, not all online advertising is the same.

The most measurable form of online advertising are search ads—ads linked with results from search queries—which can translate directly into clicks and purchases by placing a product before customers at the exact moment they are making a purchase decision. On the other hand, display ads—such as banner ads on websites—are much more visible but are less likely to translate into direct clicks. By raising brand awareness, however, display ads may contribute to a consumer’s eventual decision to click on a search ad.

“When you look at most consumers’ behavior, they do a search on Google when they are ready to make a decision,” says Gupta. “So search ads get all the credit for the sale. But search ads are at the bottom of the [purchase] funnel; display ads are at a higher level. Everybody in the industry intuitively believes that display ads drive people down the funnel, so they should get some credit—but they don’t.”

Credit where it’s due

In advertising industry parlance, such an issue is called an “attribution problem”—that is, you can’t tell which ad to attribute the eventual decision to buy. Faced with this conundrum, most companies allocate their advertising budgets in a very ad hoc manner—throwing money into whatever bucket they perceive to have most influenced past purchase decisions. Some have gone a step further by running experiments with participants to determine which type of ad is more effective. While that might help pinpoint the immediate persuasiveness of ads, it isn’t much help to measure their impact over time.

The only way to truly determine the efficacy of display ads versus search ads is to watch the effects over time, and to see how modifications in budget allocations change customers’ purchase decisions. Luckily, Gupta had access to just such data.

Initially Gupta wrote a case study for his MBA second-year course on digital marketing about a major US bank that was deciding where to place its marketing dollars to acquire new customers. Later on, Gupta was able to obtain data weekly from the bank’s advertising agency on how much money was spent and how the funds were allocated. In addition, he received data on how many consumers “converted” after clicking on search and display ads. Because a decision to open a bank account is probably a consideration one makes over time—say weeks or months in advance—Gupta could use that historical data to see how spending on different types of ads affected those decisions.

The findings from the research were recently published in the working paperDo Display Ads Influence Search? Attribution and Dynamics in Online Advertising, cowritten with HBS doctoral student Pavel Kireyev and Ozyegin University professor Koen Pauwels. In it, the authors ask two questions: First, do display ads really make a difference in pushing consumers “down the funnel” to making a purchase decision, and second, how big of a difference did they make and for how long?

Of course, implicit in those questions is a third question, says Gupta: “If you can quantify the effects, then the obvious question is how should I shift my budget to maximize my return on investment?”

Display ads effective

While they might seem like simple determinations, the calculations involved in answering those questions are incredibly complex. Gupta and his colleagues solve them using a technique called “persistence modeling.” Simply put (and the calculations are anything but simple), you first calculate the expected effect of advertising, and then see how changes in ad budgets change those expectations over time. Employing a series of regressions, the researchers were able to isolate the effects of display advertising versus search advertising.

Gupta says that when he looked at the numbers, he wasn’t surprised to find that display ads actually did affect the number of people who eventually clicked on search ads and became customers—with an increase of 5 million display ad impressions resulting in an additional 20 checking account applications through search after about five weeks.

Continue reading on www.forbes.com

huffpostBanner ads — blech. That seemed to be the consensus from a round-up of early banner ad creators and adoptersconvened recently by Digiday, who lamented that banner ads today represent “nothing but eye candy on the page” and “a race to the bottom.” And those were the nicer comments! Is there a better way?

Would Don Draper have “hated banner ads,” as Buzzfeed’s Jonah Peretti says? Probably, but as much as the trend right now is native ads and sponsored content, scalability makes it unlikely that banner ads, or the larger category of display advertising, will be completely eliminated.

Display advertising is still huge, particularly with respect to mobile.

And marketers will tell you that banner ads work, because the minuscule click-through-rates really aren’t a measurement of their effectiveness, and display should be just one part of a campaign anyway.

Continue reading on www.huffingtonpost.com

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