The buy box does not usually crash in one shot.

Most of the time, it walks down.

I was looking at a Keepa chart on a call and the lesson was simple. Seller count had tripled. One FBM seller was sitting there with a lot of stock, willing to drop the buy box by about a dollar.

That is the kind of thing beginners miss.

They see 17% ROI and think, "not perfect, but maybe still fine."

But the real question is not just ROI today.

It is:

Is competition growing?

Is there a seller with too much stock?

Is the price stair-stepping down?

Is Amazon in or out?

Are FBA sellers actually holding the price, or is one aggressive seller dragging everyone down?

On Amazon Canada, this matters even more because volume is smaller. One seller with too much inventory can change the whole listing for a bit.

So before you buy, do this:

Open the offers.

Check stock counts if you can.

Look for the downward staircase.

Compare FBA vs FBM.

Then decide if the profit is real or if you are about to buy into a price war.

ROI is not the full decision.

The buy box tells you the story.

What is one Keepa chart or buy box pattern that still confuses you when you are sourcing?

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