¿Cómo gana dinero Google con la búsqueda gratuita y quién la paga de verdad?

Google has never charged you a cent to search — and in twenty twenty-five, search made it about six hundred fifteen million dollars a day. That's roughly seven thousand dollars every second. Every time you type a question into that box, an auction runs behind the page. Companies bid for the chance to appear next to your words, and most of them pay only if you click. In twenty twenty-five, Google Search and its related ad business brought in about two hundred twenty-five billion dollars — more than half of all the revenue of Google's parent company, Alphabet. And here's the twist. In nineteen ninety-eight, Google's own founders wrote that search engines funded by advertising would be "inherently biased towards the advertisers." So how did the company that warned about ads become the biggest advertising business in the world? Who's really paying for your free searches? And what happens when AI starts answering the question before you click anything? Let's follow the money.

It started at Stanford. In the late nineteen-nineties, two PhD students, Larry Page and Sergey Brin, built a search engine that ranked web pages partly by the links pointing to them. In August nineteen ninety-eight, Sun co-founder Andy Bechtolsheim wrote them a check for a hundred thousand dollars, and Google was officially born — in a garage in Menlo Park, California. That same year, the founders published a paper describing their search engine. In an appendix, they warned that ad-funded search engines would be biased towards the advertisers, and away from the needs of consumers. But someone else had already found the business model. In February nineteen ninety-eight, an entrepreneur named Bill Gross unveiled GoTo dot com, a search engine where advertisers bid to appear at the top — and paid only when someone clicked. Google launched its own ads, called AdWords, in October two thousand, with about three hundred fifty advertisers. In two thousand two, it relaunched them as a pay-per-click auction — one where an ad people actually clicked on could outrank a higher bid. GoTo, by then called Overture, sued over its patent, and Yahoo took over the case when it bought Overture. In two thousand four, Google settled by handing Yahoo two point seven million shares. The founders' warning was in the past. The auction was the future.

Here's how the machine works. Every time someone searches, Google runs an auction for the ad spaces on that page. Advertisers choose the words they want to show up for — say, "car accident lawyer" — and set the most they're willing to pay for a click. But the highest bid doesn't automatically win. Google ranks ads by what it calls Ad Rank: the bid, the quality of the ad and the page it leads to, the context of the search, and a few other factors. And the winner often pays less than its maximum bid. Google says you'll never see more than four text ads in one group, now labeled "Sponsored results." Then there's the price. In twenty twenty-six benchmark data from the marketing firm LocalIQ, the average cost per click across industries was about five dollars and forty-two cents. For attorneys and legal services, it was nearly ten dollars — for a single click, whether or not that person ever becomes a client. So every search is really two things at once: a question from you, and a sales opportunity for everyone bidding on your words.

Now multiply that by the whole planet. Google says it handles more than five trillion searches a year. In twenty twenty-five, the revenue line Alphabet calls "Google Search and other" — mostly search ads, plus ads in products like Gmail and Maps — came to about two hundred twenty-five billion dollars. That's more than half of Alphabet's four hundred three billion dollars in revenue. Divide it out, and it's about six hundred fifteen million dollars a day. Spread across more than five trillion searches, that averages out to less than five cents per search. But the average hides a lot. A search for a sports score or the weather often shows no ads at all. The money comes from searches with something to buy behind them: insurance, flights, loans, lawyers, shoes. In its latest quarter, Google said retail and finance were the biggest contributors to search growth. And the profit margin is enormous. In the second quarter of twenty twenty-six, Google Services — search, YouTube, Android and the rest — earned about forty-two cents of operating income on every dollar of revenue.

So who's the customer? Not you. You don't pay for search; advertisers do. And what they're buying is something unusually valuable: intent. When you type "best running shoes," you've told Google exactly what you want, at the moment you want it. That's what an advertiser is paying for. Google can also use what it knows about you to choose which ads you see. According to its own help pages, that can include your activity on Google's sites and apps, your YouTube history, and the general area you're searching from. You can switch those off in a settings page called My Ad Center. You'll still see ads — they just won't be tailored to you. But the core of the business doesn't need your history at all. The words you type are the signal. Every search is a small, free confession of what you want — and Google has built a marketplace to sell the space right next to it.

But an auction only works if people use your search box. So Google pays to be the default. In its accounting, these payments are called traffic acquisition costs: money Google shares with phone makers, browsers and websites that send it searches or show its ads. In twenty twenty-five, they added up to about sixty billion dollars — roughly a fifth of Google's ad revenue. The biggest single partner is Apple. Documents from the government's antitrust case showed that Google paid Apple about twenty billion dollars in twenty twenty-two to be the default search engine in Safari. During the trial, an economist testifying for Google revealed that Apple receives thirty-six percent of the search ad revenue Google earns through Safari. Google's chief executive, Sundar Pichai, later confirmed that figure in court. Across all its partners, Google paid more than twenty-six billion dollars in twenty twenty-one for default placement — up from about seven billion in twenty fourteen. Think about what that means. The most popular search engine in the world pays tens of billions of dollars a year so that most people never have to choose it.

Eventually, the government asked whether that was legal. On August fifth, twenty twenty-four, federal judge Amit Mehta ruled in the Justice Department's case. His conclusion: "Google is a monopolist, and it has acted as one to maintain its monopoly." The ruling found that Google had about eighty-nine percent of general search — and nearly ninety-five percent on mobile devices. The penalties came in September twenty twenty-five, and they were milder than many expected. Google did not have to sell its Chrome browser. It could keep paying Apple and others to be the default — but it could no longer sign exclusive deals, and the judge later limited those contracts to one year at a time. Google also has to share some of its search data with qualified competitors. Both sides appealed. Google is asking the appeals court to throw out the whole ruling. The Justice Department wants the court to reconsider a ban on those big default payments. The case is now in front of the federal appeals court in Washington. And in his ruling on the penalties, the judge pointed to something that might matter more than any court order: a new kind of competition.

Judge Mehta wrote that generative AI poses "a threat to the primacy of traditional internet search." Google's answer has been to put AI inside search itself. Its AI Overviews — the summaries at the top of the results — reached one and a half billion users a month by the spring of twenty twenty-five. AI Mode, a chatbot-style search, has passed one billion monthly users. That creates a problem for the old machine. If the answer is already on the page, fewer people click — on websites, and maybe on ads. In a twenty twenty-five study, the Pew Research Center found that people clicked a regular link on eight percent of search pages that showed an AI summary, compared with fifteen percent of pages that didn't. Google disputed the study's method. And so far, its numbers haven't cracked. In the second quarter of twenty twenty-six, search revenue grew seventeen percent, to sixty-three point three billion dollars. Google is now testing clearly marked sponsored links inside AI Mode's answers. Rivals are copying the model: this year, OpenAI announced it would start testing ads inside ChatGPT. And Google plans to spend up to two hundred five billion dollars on capital investment this year, mostly on servers and data centers. For now, it still handles about nine out of ten searches worldwide.

So who pays for free search? Advertisers pay first. A law firm can spend close to ten dollars for one click. A local plumber can end up bidding against national chains for the same words. Advertising is a cost of doing business, and businesses usually build their costs into their prices. Websites pay too, in a different way: if fewer people click through, publishers that depend on search traffic earn less. And you pay with your attention — and with your data, if you leave ad personalization on. Google, of course, comes out ahead. Alphabet earned about one hundred twenty-nine billion dollars in operating income in twenty twenty-five. So a few things are worth knowing. The first results on the page are often ads. Google groups them under a "Sponsored results" label, and there's a button to hide them. If you're shopping, scroll past the ads and compare. If you'd rather not be profiled, open My Ad Center and switch personalization off. And if a search feels like it's selling to you — it is. The search is free. The space next to your question is what's for sale.

Next time on Margin, we follow the money into a price you pay almost every day — and almost never question. If you want to understand how money actually moves before the headlines catch up, subscribe — and follow the money.