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Reason 1: The "New Neighbor" (Competition)

Someone else wants your spot.

Google Ads is an auction. If you are paying $2.00 for a click and a new competitor enters the market tomorrow bidding $3.00, your price goes up. You have to pay more just to keep your position on the page.

How to check:

1. Open your campaign.

2. In the left menu, go to Insights and reports › Auction insights.

3. Look for new names in the list, or competitors whose impression share has suddenly jumped.

Reason 2: The Quality Score Drop

Your ads got "rusty."

Google rewards quality in its auction.

High Quality Score (e.g., 10/10): You often pay less per click.

Low Quality Score (e.g., 3/10): You often pay more to stay visible.

If your CPC jumped suddenly, check your Quality Score. Did you change your landing page? Did you rewrite your ads? If your click-through rate (CTR) dropped, your CPC can rise.

The fix: Improve your ad relevance or revert recent landing page changes.

Reason 3: Bidding Strategy Changes

Did you unleash the AI?

If you recently switched from Manual CPC to Maximize conversions, your CPC will very often go up.

Reason 4: The Fraud Spike

Competitors draining your cheap clicks.

Sometimes a high CPC is a symptom of click fraud. If a competitor uses a bot to click your ad 50 times in the morning:

1. Your daily budget drains quickly.
2. Fake clicks pollute the data your bidding strategy learns from.
3. Your bids may drift toward the wrong auctions and profiles, pushing up your average CPC.

The fix: Check your ClickSambo dashboard. If you see a spike in blocked clicks on the same day your CPC went up, the "price hike" was likely driven by a fraud attack distorting your data.