Why two advertisers pay different prices for the same keyword

Quality Score is the 1–10 rating you see per keyword. Google describes it as a diagnostic tool, based on three components — expected click-through rate, ad relevance and landing page experience — each rated above average, average or below average (Google Ads Help). It is not itself an input to the auction, but it is a useful summary of the same signals the auction uses in real time.

That distinction matters: chasing a 10/10 score isn't the goal. Fixing whatever the components flag is.

Two clinics in Andheri bid on "dental implants cost". Clinic A sends every search to its home page, with one generic ad for "best dental clinic". Clinic B has an ad group just for implants, an ad that mentions implants and a starting price, and a landing page about implants with the price range, the dentist's credentials and a booking form. Google expects more people to click B's ad and to find what they wanted — so B can hold the same position for less, or a higher one for the same money.

Prices on Google vary hugely by category and city. Searches with high commercial value — loans, insurance, real estate, education, legal and some healthcare — attract many bidders and cost more; local service searches in smaller cities often cost far less. Search intent matters as well: "cost", "near me" and "book" searches are worth more than research queries, and are bid up accordingly. When comparing your CPCs with anyone else's, compare the same category, city and intent.

Sometimes paying more is correct. If a keyword converts well and your margin supports it, losing impression share to save a few rupees per click can cost more revenue than it saves. The question isn't "how do I get the lowest CPC?" but "what CPC can each conversion afford?" — which depends on conversion rate and the value of a customer. See our Google Ads guide and Google Ads service.

Match types decide which searches can trigger your ads; Smart Bidding decides how much to bid in each auction. Broad match with Smart Bidding can find valuable searches you would never have listed, but only when conversion tracking is accurate and negative keywords keep out irrelevant intent. Exact and phrase match give tighter control and are useful for brand terms and high-value queries. Many accounts use a mix: exact or phrase for core terms, broad in a separate campaign or ad group to discover new queries, with the search terms report reviewed weekly.

Competitors bidding on your brand name raise your brand CPCs and can take clicks from people who were looking for you. Keep a brand campaign running, make sure your ads and sitelinks are the most useful result, and check trademark policies if a competitor uses your trademark in ad text. Bidding on competitors' names yourself is usually expensive and low-converting; test it carefully, if at all.