This Issue's TLDR...

• How to split test using synthetic audiences
• Amazon is copying Google's homework, again
• Why you need to master Open Loops

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I presented to Helium 10's Elite community this week. The recording is exclusive to that community, but for all of you, my wonderful Best@Amazon readers, here's my Maximizing Image I.M.P.A.C.T. on Amazon slide deck.

In the Q&A to my presentation, the topic of market research and split testing came up, and I talked about how it's actually possible to use AI to build synthetic audiences and test your creatives based on that.

Of course, I received A LOT of questions on this topic.

I mentioned that I previously authored a step-by-step explainer on using AI to create synthetic audiences.

So, to make the lives of all my new readers easier, here is that post, again:

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Look, I know that I talked last week about why you shouldn't try to predict the future, and instead you should position yourself to win, in multiple futures.

I stand by that.

But, the reality is that prediction is necessary in this Amazon and eCommerce world that we all live in.

Fortunately, we have some great third-party tools (e.g., PickFu, Intellivy, ProductPinion) to predict, based on data.

These market research tools all come with a cost though.

What if you can't afford that cost? Or, what if you're just...cheap scrappy?

Well, good news.

Because a group of BIG BRAINED research scientists tested, and proved, that you can replicate the results of human polls/surveys using LLMs and "synthetic audiences."

How exactly can you do this?

You're going to need to run a series of prompts, which I'll lay out for you below.

If you really want to scale this to large samples (e.g., n=1000), you're going to want to use the Gemini Batch API. Honestly, just ask Gemini to walk you through how to do that.

Step 1: Upload Your Assets

Start a new chat with Gemini 1.5 Flash. Upload the two product images you want to test.

Label them clearly in the chat as "Image A" and "Image B" so the model doesn't get confused.

Step 2: The "Mass Persona" Prompt

Instead of doing one persona at a time, you will ask Gemini to generate the audience and simulate their reactions in one go.

Prompt 1: Audience Generation & Initial Reaction

Step 3: The "Aggregator" Prompt

Once Gemini finishes the long list (it might pause; if so, just type "Continue"), you need to turn that wall of text into usable data.

Prompt 2: Quantitative Summary

A Couple Refinements...

You might want to dial in to your specific consumer persona with more specificity. Here's a prompt refinement to do that:

The Specific Persona Refinement

Copy and paste this prompt, filling in the bracketed info for your specific brand.

Or, you might want to make the consumer responses more raw and real. Use this refinement:

The "Critical Persona" Refinement

To avoid the "Politeness Bias" (where LLMs tend to say both images look "nice"), add this System Instruction before you start the simulation:

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BEST from LinkedIn

TLDR - Amazon Ads continues to follow in the footsteps of Google, this time, introducing a new, beta feature that essentially Google PMax.

Thanks, Mansour!

BEST from X

Have you heard of Knockoff??

If you haven't go read this tweet, and then download the Chrome extension.

As of today, over 11 million have seen it, and over 100k have downloaded it.

Josh Pigford @Shpigford Knockoff is now live! Filter out the knockoff crap brands on Amazon. Sorry to brands like WNPETHOME, EHEYCIGA, YXYL, LU&MN, JOYIN, TOMY, GODONLIF, YOOJEE, LINGTENG, LANEIGE, VISCOO, BIODANCE, COOFANDY, BALENNZ, TOSY and LUENX. https://knockoff.shopping https://twitter.com/Shpigford/status/2074140613902045652 Josh Pigford @Shpigford built a little chrome extension that lets you dim (or hide!) all the crap, mass-produced, fake brands on amazon. should i release it? 7:50 AM • Jul 7, 2026 3973 Retweets 55774 Likes Read 1228 replies

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BEST from X [BONUS]

For a couple years now, I've been screaming that Amazon sellers need to evolve from Performance Advertisers to Direct Response Marketers.

Your ad creative -- both visual content and messaging -- will be more important than ever, and your ads need to hook potential customers in the first 3 seconds (or less).

This demands an acute understand of human psychology, and what stops the scroll.

Start here:

Brian Blum @brian_blum1 Your content flops because it is a flat story. You must learn the Art of Open Loops: 7:42 AM • Apr 28, 2026 13 Retweets 280 Likes Read 13 replies

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