Auto insurance giants lead the pack in advertising expenditures, pouring over $1.5 billion annually into campaigns despite their widespread recognition. When familiar faces like Geico’s gecko or Progressive’s Flo appear in yet another commercial, questions arise about the value of such repetition.
The Advertising Enigma
Marketing experts have puzzled over advertising’s mechanics for over a century, yet solid empirical insights remain elusive. One theory posits that ads deliver fresh information to consumers, but this fails to explain why established brands continue heavy spending. Another idea suggests ads forge mental links between brands and product categories, though these connections lack precision in predicting outcomes.
“That’s where the puzzle starts,” notes Navdeep Sahni, a marketing professor at Stanford Graduate School of Business. He explains that priming consumers to recall one brand, such as Geico, could either enhance or diminish thoughts of rivals like Progressive, leaving the theory vague.
Breakthrough Insights from Recent Research
Sahni, alongside doctoral candidate Yifan Yang, addresses these gaps in a new working paper. Their analysis reveals that auto insurance ads not only drive traffic to the advertiser’s site but also disrupt recall of competitors, effectively sidelining them from consumer consideration. This dynamic underscores the necessity of ongoing, repetitive campaigns to maintain top-of-mind status.
The Experimental Approach
The study employs a large-scale randomized controlled trial, a rare method in advertising research. Traditional studies often rely on lab surveys or market comparisons, which can introduce biases. Instead, researchers targeted over 325,000 visitors to a major global website who had installed a relevant browser extension.
On a single day, 75% of participants viewed a banner ad for an auto insurance provider, while the remaining 25% encountered a neutral public service announcement. Results showed an immediate spike in site visits for the advertiser, rising from 0.2% to 0.8% likelihood—a 300% uplift.
Tracking extended three months revealed that while immediate effects faded quickly, cumulative impacts matched the initial surge. “This very strong effect dissipates in a matter of days,” Sahni observes. “However, if we continue to look into the future, then the effect comes back, and the total cumulative future effect of advertising is the same as what we see on the day of the advertisement.”
Effects on Competitors
Delving deeper, the research examines ripple effects on rivals. No immediate drop in competitor traffic occurred on the ad day, indicating the boost stemmed from heightened category awareness rather than direct theft. Yet, the next day brought an 11% decline in visits to competitors’ sites—mirroring the advertiser’s gain.
“On days immediately after the advertisement is when competitors stand to lose the most,” Sahni states. Exposure to the ad elevated the advertiser’s prominence and category salience, leading consumers to favor it in subsequent insurance considerations.
A Competitive Battlefield
Further analysis shows that rival TV ads in preceding weeks amplify the banner ad’s impact. This stems from an ongoing struggle for attention: competitors’ promotions temporarily displace the advertiser, making a fresh ad more potent in reclaiming mental space.
“This creates an incentive to advertise more, which is one of the key implications of our work,” Sahni says. “This is a combative environment.”
By quantifying ad strength, memory persistence, and competitive interactions, the researchers built a predictive model that surpasses industry standards when tested on new data. While focused on auto insurance, these findings pave the way for broader advertising models.
“The objective of this paper was to lay the groundwork for developing these more detailed models,” Sahni adds. “Our paper stands out in predicting effects, and it gives us a path for thinking in a more structured and rigorous manner about consumer perceptions, about what is top-of-mind when they’re making decisions.”
Navdeep S. Sahni et al, Consumer Memory and Competitive Interference: The Case of Auto Insurance Advertising (2024). DOI: 10.2139/ssrn.4968643
