Interactive demo with synthetic data. This environment demonstrates Terra PPC workflows using synthetic advertising, seller-business, financial and economics data. Actions remain inside this demo and are not sent to Amazon or any external advertising or selling account.

Cost & Price Regimes

Runs of days with the same price and the same unit cost, and what each run earned. Comparing regimes separates a price effect from a cost effect.

Terra Home & Packaging / USLast 30 daysSELLERFINANCEASSUMPTIONADSDERIVED

Product

All information shown in this module is synthetic demo data and does not represent a live Amazon selling account.

Regimes in Period

1 cost change · 0 price changes

SELLERASSUMPTIONDERIVED

Current Price

$31.99

In force since Aug 6

SELLERASSUMPTION

Current Unit Cost

$10.85

FIFO · v2 · layer received Aug 21Next $11.83 from Sep 28

ASSUMPTION

Modeled Net Margin

28.4%

Latest regime · Sep 20–Sep 24

SELLERFINANCEASSUMPTIONADSDERIVED

Daily sales and economic events

SELLERFINANCEASSUMPTION

Black Gift Boxes · last 30 days. Dashed lines mark the days the unit cost or the price changed, a promotion ran or refunds were high.

Units
Cost change
Promotion
High refunds

Units of Black Gift Boxes per day over the last 30 days: 151 units in total; 2 cost-change days, 2 promotion days, 3 high-refund days.

What changed between regimes

ASSUMPTIONSELLERDERIVED

Each boundary with its cause and the change in modeled net margin.

Sep 20Regime 1 → 2Cost change0.0 pts change in modeled net margin
Unit cost
$10.60 to $10.85
Modeled net margin
28.4% to 28.4%
Break-even ACoS
39.8% to 42.0%
Only the unit cost changed. On its own it moves the margin by about −0.8 pts (the cost change ÷ the later average selling price); fees, refunds, promotions and ad spend on each regime's days account for +0.8 pts, for a total of 0.0 pts.

Regimes

SELLERFINANCEASSUMPTIONADSDERIVED

One row per run of consecutive days with the same price and the same unit cost.

Cost and price regimes of Black Gift Boxes, last 30 days
	List price of the price period in force, with its coupon on the next line when one applies; — when no price period covers these days. The last line is the regime’s Seller Gross Revenue ÷ units sold. The synthetic sales series is not generated from the price periods, so this average can differ from the list price.	Landed cost per unit of the cost record (version or purchase layer) that costed these days.							Before ad spend: Seller Gross Revenue − refunds − promotions − Amazon fees − COGS − other variable costs + reimbursements.
Aug 26–Sep 19Regime 1	$31.99avg. $33.95 per unit sold	$10.60v1 · layer received Jun 20	25	82	$2,783.86	$145.00	$869.70	$316.84	$1,107.59	$790.75	28.4%	11.4%
Sep 20–Sep 24Regime 2	$31.99avg. $29.51 per unit sold	$10.85v2 · layer received Aug 21	5	69	$2,036.14	$0.00	$748.65	$276.56	$854.80	$578.24	28.4%	13.6%
Total · 2 regimes			30	151	$4,820.00	$145.00	$1,618.35	$593.40	$1,962.39	$1,368.99	28.4%	12.3%

Contribution = Seller Gross Revenue − refunds − promotions − Amazon fees − COGS − other variable costs + reimbursements. Modeled net profit = contribution − ad spend; Modeled Net Margin and TACoS divide by Seller Gross Revenue. Refunds are subtracted once. The average per unit sold comes from the synthetic sales series and can differ from the list price. Modeled values, not GAAP profit or taxable income.

How regimes work

A regime is a run of consecutive days with the same price and the same unit cost: the same price period and the same cost record (a cost version, or a purchase layer for FIFO and weighted average). A new price period or the next cost record starts a new regime.
Comparing regimes separates a price effect from a cost effect. Where only the unit cost changed, the margin difference is the cost effect; where only the price changed, it is the price effect, with the fees and refunds that move with the price. The cost effect is estimated as the unit cost change ÷ the later regime’s average selling price.
Days without sales belong to the regime before them. A FIFO day that sells from two purchase layers belongs to the layer that sold the most units that day, and its cost is the blend of both.
Chart markers: cost change — the cost of the units sold differs from the previous selling day; price change — a new price period starts; promotion — promotion or coupon costs were posted that day; high refunds — refunds above 10% of that day’s Seller Revenue.
Prices are set on Price History and costs on COGS; the regimes follow every saved change. Everything shown is synthetic and modeled with Terra PPC’s deterministic rules.

Open Price History Open COGS Open P&L by Cost Period