Spotting Price Gaps on Keepa Charts: A Reseller's Guide to Fair Value Shifts

Anyone who has stared at a Keepa graph for long enough will have noticed it: a product sitting flat for weeks, then suddenly jumping to a new price level and staying there. Traders in the stock and forex world have a name for this kind of move - a fair value gap. The same pattern shows up constantly in Amazon price history, and once you know how to read it, it can genuinely sharpen your sourcing and pricing decisions.

This guide takes the fair value gap concept from price action trading and translates it into something UK resellers can actually use when scanning Keepa charts, deciding whether to buy stock, and working out whether a price move is likely to stick or snap back.

What a "price gap" looks like on a Keepa chart

In trading, a fair value gap forms across three candles: a normal price, a big sudden move, and then a new price level that doesn't fully retrace back to where it started. The middle move is so strong that the market never fully "fills in" the space it left behind.

On Amazon, you see the exact same shape. A product sits around one price for a while, something happens (a competitor goes out of stock, a listing gets hijacked, demand spikes, a supplier issue hits everyone at once), the price jumps hard, and then instead of falling back to where it was, it settles at a new, higher level and stays there.

That gap between the old price range and the new one is the space worth paying attention to. It tells you the market has decided the item is genuinely worth more now, not just temporarily inflated.

Spotting a bullish gap (price has stepped up)

• Look for a period of stable pricing, followed by a sharp upward spike.
• Check that the price after the spike does not fall back down into the old range.
• If it holds above the old range, that gap between the two price levels is your zone of interest.
• If the price later dips back down towards that gap and holds, rather than crashing straight through it, that's often a sign the new higher level is being respected by the market, and can be a decent point to buy in before demand pushes it up again.
• If price instead falls straight through the bottom of that gap, treat the move as failed. The old, lower price range is back in play and the "new normal" theory no longer holds.

Spotting a bearish gap (price has stepped down)

• Look for a stable price followed by a sharp drop.
• Check the price doesn't recover back up into the old range afterwards.
• If it settles at the lower level, this can be a warning that current fair value has genuinely shifted down - useful if you're holding stock and deciding whether to wait for a bounce or cut losses sooner.
• If price does climb back up through that gap, the drop was likely temporary noise (a stock glitch, a one-off cheap seller, a returns dump) rather than a real change in value.

Why these gaps actually form

A sudden spike usually starts with something forcing buyers to act (a stockout, a bulk purchase, a listing suppression removing competition). Normally you'd expect the price to fall back afterwards as people who bought in take profit. But when it doesn't fall back, that's telling you something important: the remaining sellers and buyers now genuinely believe the new price range is fair, not inflated.

Think of it like this: a product bouncing between £9 and £10 suddenly jumps to £11 after a competitor stock-out. If it settles into an £10-£11 range afterwards rather than sliding back to £9-£10, the market has repriced the item. Sellers restocking now expect to sell at the new level, and buyers are willing to pay it. That's your signal the increase has staying power, at least for now.

Best timeframes for spotting these moves

Just as traders find fair value gaps most useful on short intraday charts rather than long-term monthly ones, resellers get the most value from watching short-term price movement rather than only glancing at 90-day or yearly Keepa averages. Daily and even hourly price changes are where these gaps show up first, and reacting quickly is often what separates a profitable restock from missing the window entirely.

Which products to apply this to

This approach works best on products with decent sales velocity and multiple active sellers, where price changes reflect real supply and demand rather than a single seller messing about with their pricing. Slow-moving, single-seller listings are far less reliable for this kind of read, because a "gap" there might just be one account changing their price with no real market pressure behind it.

A word on accuracy

Because you're reading a pattern that forms quickly, off just a small stretch of price history, it won't always play out. Some gaps get filled in completely and the old price returns. Treat this as one signal among several rather than a guaranteed rule, and combine it with sales rank history, stock level tracking, and general category knowledge before committing real capital.

Putting this into practice

Reading Keepa charts for gaps like this takes a bit of screen time, which is exactly where a community helps. Lunar FBA members regularly flag price movements and restock windows in the group as they happen, so you're not stuck refreshing charts alone all day. Pairing that with a decent price tracking tool and a bit of Keepa reading practice makes it much easier to catch these shifts early, buy stock at the right moment, and avoid getting caught holding inventory just as a price move reverses.

None of this replaces solid due diligence, but understanding why prices gap and hold (rather than treating every spike as random) gives you a genuine edge when deciding what to source, when to buy, and when to hold off.