Coca-Cola did not change its formula on a whim. By the early 1980s it had a slow-motion problem. After World War II it held 60 percent of the cola market; by 1983 that had fallen below 24 percent, with Pepsi taking much of the difference. Worse, Pepsi was winning on the one thing a soft drink company cannot argue with: taste. Its televised blind taste tests kept showing people picking the sweeter cola.
Roberto Goizueta, who became CEO in 1980, had told employees there would be no “sacred cows.” The most sacred one was the recipe itself.
Project Kansas
Marketing vice president Sergio Zyman and Coca-Cola USA president Brian Dyson ran a secret effort to develop a new flavor. It was code-named Project Kansas, after a well-known photo of Kansas journalist William Allen White drinking a Coke.
The research looked conclusive. The new, sweeter formula beat regular Coke and Pepsi in taste tests, surveys and focus groups, with nearly 200,000 consumers tested. There was one warning sign the company underweighted: about 10 to 12 percent of testers said they felt angry at the idea of changing Coke at all, and that they might stop drinking it.
The timing also seemed right. The change could coincide with the drink’s approaching centenary, and a bold relaunch fit the story of a company modernizing under new leadership.
Launch day, and the reaction
The new Coke went on sale on April 23, 1985. At first, sales were fine; in some reports they were up on the year before. What the company had not modeled was how people would feel about losing the old one.
The backlash grew for weeks. Coca-Cola received more than 40,000 calls and letters of complaint, including one addressed to “Chief Dodo, the Coca-Cola Company.” By June its hotline was handling about 1,500 calls a day, against roughly 400 before the change. Gay Mullins, a Seattle retiree, founded Old Cola Drinkers of America and spent borrowed money on a campaign to bring the original back. People stockpiled cases of the old drink; one man in San Antonio bought $1,000 worth from a local bottler.
The complaints were rarely about flavor. In informal blind tests, Mullins himself either could not tell the two apart or preferred the new one. What people objected to was the idea that a company could take away something that felt like part of their lives.
The reversal
On July 11, 1985, 79 days after the launch, Coca-Cola announced that the original formula was coming back as Coca-Cola Classic. ABC News anchor Peter Jennings interrupted the soap opera General Hospital to break the news. The company’s hotline took 31,600 calls in the two days that followed.
Company president Donald Keough summed it up in a line that has been quoted ever since: all the research could not “measure or reveal the deep and abiding emotional attachment to original Coca-Cola felt by so many people.”
For a while both drinks were sold side by side, with separate ad campaigns. It was not close. By the end of 1985 Coca-Cola Classic was outselling both the new Coke and Pepsi.
Why it failed
- The research answered the wrong question. A sip test measures which liquid people prefer in the moment. It does not measure how they will react when a familiar product disappears.
- The warning was in the data. The minority who said they would feel alienated turned out to be loud, organized and representative of a much larger feeling.
- It contradicted Coke’s own advertising. Coca-Cola had spent years telling people its less-sweet taste was a reason to prefer it over Pepsi. The new formula tacitly admitted Pepsi had been right.
- Replacing beat extending. Had the new flavor launched alongside the original, the company could have tested demand without taking anything away.
What happened next
Some commentators later argued that the whole episode was a clever plan to revive interest in the original. The company has always denied it, and Goizueta later described the decision as an example of “taking intelligent risks.” Whatever the intent, the return of Classic did give Coca-Cola a burst of attention no ad budget could buy.
The new formula was renamed Coke II in 1990 and quietly discontinued in 2002. It reappeared briefly in 2019 as a promotion for the Netflix series Stranger Things, which is set in 1985. Today New Coke is the standard warning in business schools about changing a well-loved product without understanding why people love it.