If you launched an Amazon PPC campaign and just accepted whatever match types Amazon gave you by default — you're almost certainly spending more than you need to for each click. And worse, you're probably getting clicks that will never convert.
Match types are the foundation of every campaign. Get them wrong and your ACOS climbs no matter how clever your product listing is. Get them right and you can cut wasted spend by a quarter while keeping the same sales velocity.
The rule most sellers miss: Broad match reaches the widest audience but creates the most waste. Exact match is the most precise but limits discovery. Phrase match is the middle ground — and most sellers set it and forget it without ever optimizing it.
How Amazon's Three Match Types Actually Work
Before you can optimize, you need to know what each type actually triggers. Amazon's documentation is vague — here's the practical reality:
| Match Type | What It Triggers | When to Use It |
|---|---|---|
| Exact | Search exactly matches your keyword, or close variants (plural, singular, common misspellings, reorderings) | High-intent buyers. Keywords you know convert. Control spend on proven terms. |
| Phrase | Search contains your keyword in the same sequence. Extra words before or after are OK — but not between. | Discovery with intent guardrails. Good for category-level terms. — Most underutilized |
| Broad | Any word in your keyword can match in any order. Misspellings, synonyms, related concepts all trigger. | Testing new products, expanding reach. Requires tight negative keyword discipline. |
Mistake #1: Running Everything on Broad Match
Broad match is the default setup for sellers who just imported their keyword list and hit publish. It's also the most expensive setup you can run.
Here's what happens: you bid on "leather wallet men". Amazon shows your ad for "cheap fake leather wallet for men". It matches on the words "leather" and "wallet" and "men" — even though the shopper's intent is almost the opposite of what you're selling.
The result? Your click-through rate tanks, your conversion rate collapses, and Amazon learns your ad is "low quality" for that placement — which raises your effective CPC over time.
Broad match has a legitimate use: new products in the discovery phase where you genuinely don't know what search terms convert. Once you have 30 days of data, migrate your best keywords to exact and use broad only as a testing ground, not your primary bid allocation.
Mistake #2: Not Using Negative Keywords Aggressively
Negative keywords are the single highest-leverage action in any PPC campaign. Yet most sellers add two or three and call it done. That's like locking one door in a house with twelve windows.
After your first 7 days of campaign data, go to your search term report. Look for every query that consumed budget without delivering a conversion in the last 14 days. Those are your negative keyword candidates.
How to build your negative keyword list:
- Irrelevant intent: "free," "cheap," "used," "bulk," "wholesale" — terms that signal a non-buyer
- Wrong category: If you're selling premium coffee mugs and you see searches for "travel coffee mug" that don't convert, add "travel" as a negative
- Zero-conversion queries: Any search term with 5+ clicks and 0 conversions in 30 days
- Mismatched gender/age: Terms like "kid," "boys," "girls" when your product is adult-focused
Add negatives weekly, at minimum. This is not a one-time setup task — it's ongoing hygiene that directly controls your ACOS.
Mistake #3: Using the Same Bid for All Match Types
If you're bidding $1.50 across exact, phrase, and broad on the same keyword, you're either overpaying for exact or underpaying for broad. Neither is optimal.
The practical framework:
- Exact match: Bid highest. These are your proven terms. A sale here has the highest customer lifetime value signal.
- Phrase match: Bid 70–80% of your exact bid. These are slightly broader intent, so expect a lower conversion rate — but the cost per click should reflect that.
- Broad match: Start at 50–60% of exact bid. You want enough bid to get data, not so much that you burn budget on bad placements.
Rule of thumb: If your exact match keyword has a 12% conversion rate and a $1.20 ACOS, try it at phrase at $0.90 and broad at $0.65. Let the data tell you if you should adjust up or down — but always start tighter on broader match types.
Mistake #4: Ignoring Search Term Reports for 30+ Days
The search term report is the most valuable document in your advertising account. It tells you exactly what people searched to find your ad, how much you spent, and what you got back.
Sellers who check it monthly (or never) are essentially flying blind. The market changes, competitor bids shift, and the terms that converted last month may be losing money this month.
Minimum cadence: every 7 days, review your search terms at the ad group level. Look for three things:
- Terms with high spend but no conversions — add to negative keywords immediately
- Terms with high conversions but below-target ACOS — raise bids to capture more share
- New terms with 3+ conversions — add them as new exact match keywords
This cycle — spend, review, adjust — is how you compound your campaign performance over time. Without it, you're running on last month's data and making decisions on stale information.
Mistake #5: Not Structuring Campaigns by Match Type
When you bundle exact, phrase, and broad match keywords into the same ad group, you create a bid management nightmare. Amazon will show your exact match keywords in broad auctions, and you'll never know if your exact terms are performing or if broad match is doing the heavy lifting at a worse ACOS.
The right structure: one campaign, three ad groups — one per match type. This lets you:
- See exact match performance clearly, without broad match noise
- Adjust phrase match bids independently without affecting exact
- Test whether moving a phrase keyword to exact (or broad) improves your ACOS
This structure is how professional Amazon advertisers manage campaigns. It takes 20 extra minutes to set up, but it gives you the control to actually optimize rather than just guess.
How to Actually Fix This: The Practical 3-Step Process
Knowing the mistakes is the start. Here's how to actually fix them, step by step:
Step 1: Export your current campaigns and map match types
Download your campaign performance report for the last 30 days. For each keyword, note its match type and its ACOS. Flag any keyword where broad match ACOS is more than 20% higher than exact match ACOS on the same root keyword.
Step 2: Restructure or add new match-type ad groups
For your top 20 keywords by spend, create dedicated exact match ad groups. Move those keywords out of the shared ad group. Run them separately for 14 days and compare performance.
Step 3: Set up a weekly optimization cadence
Block 30 minutes every Monday morning. Review the prior week's search terms, update negatives, adjust bids, and add new converting keywords as exact match. This is the habit that separates sellers with 25% ACOS from sellers with 35% ACOS on comparable products.
Stop manually managing match types in a spreadsheet
Mercanto automatically restructures your campaigns by match type, flags high-waste terms, and adjusts bids weekly so your ACOS reflects actual profitability — not guesswork.
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