> For the complete documentation index, see [llms.txt](https://sourcesheets.gitbook.io/sourcesheets-new-seller-blueprint/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://sourcesheets.gitbook.io/sourcesheets-new-seller-blueprint/part-4-sourcing-and-buying-your-first-products/7.5.3-phase-3-demand-and-stability.md).

# Phase 3: Demand & Stability (Gates 3–4)

Once a product survives the financial gates, we move into Phase 3, where many products that "look profitable" fail for very different reasons. This is where beginners most often get caught out.

At this stage the question changes. We're no longer asking if a product sells, we're asking whether it sells consistently, at predictable prices, under normal conditions.

**Why demand comes after the maths.** Financial viability earns a product the right to be analysed further. Demand and stability determine whether that viability can realistically hold once you enter the listing. A product can look profitable today and still be unsuitable if sales behaviour is erratic or driven by temporary factors. This phase filters out products that only work under perfect timing.

## Gate 3: Sales Velocity Consistency

Sales velocity should be assessed as a pattern, not a moment, over a rolling 30-day window. As a beginner starting point, the Blueprint uses a floor of **50 sales per month**. Below that, there usually isn't enough volume to absorb a slow week without the whole buy stalling, so the product fails here.

What misleads beginners is treating short-term activity as proof of demand. A single strong day, week, or rank spike doesn't mean demand is stable, and it doesn't mean the 50-a-month average is real. Sales spikes are often caused by temporary promotions or vouchers, competitors running out of stock, Amazon intervention, or clearance and price-matching activity. If sales appear clustered into bursts rather than spread consistently across the 30-day window, the product should fail at this gate even if the raw total clears 50.

## Gate 4: Rank Behaviour Over Time

Rank must be viewed as a trend over the same 30-day window, not a snapshot. As a working definition: if a product's rank swings more than roughly **50% in either direction within 30 days**, with no identifiable cause (a known promotion, a competitor stockout, a seasonal event), treat it as unstable and fail the gate. Stable products show gradual movement up and down, a clear correlation between price and rank, and fluctuations that stay inside that band.

Unstable products show sudden vertical rank drops and recoveries, long flat lines followed by sharp spikes, or rank movement that doesn't align with price changes.

When rank behaviour doesn't make sense, it usually means demand is being artificially influenced rather than naturally sustained.

**Price movement patterns matter more than most sellers realise.** Price behaviour often confirms what sales and rank are already suggesting. Products with reliable demand move slowly in price, adjust in small competitive steps, and stay within a narrow Buy Box range. Products with unstable demand show sharp price drops, sudden recoveries, and frequent, large swings, usually a sign of aggressive competition, panic selling, or Amazon price control. Even if a product looks profitable at the moment of analysis, unstable pricing makes that profit unreliable.

**Why volatility kills beginners.** Volatility increases risk in ways new sellers can't easily manage: buying just before a price collapse, listing into an active race to the bottom, or relying on demand that disappears quickly. Experienced sellers may tolerate volatility because they understand seller behaviour and can react quickly. Beginners don't have that margin for error. If a product only works with perfect timing, it isn't suitable at this stage.

## Outcome of Phase 3

Only two outcomes are possible: fail, if demand or price behaviour is unreliable, or proceed, if demand appears consistent and price movement is predictable. Passing this phase doesn't mean demand is guaranteed, it means demand is understandable, which is what lets you manage risk.