01 · DEMAND
Demand durability
Is search and purchase intent structural or fad? Seasonality, replacement cycles, and category growth set the base rate.
Investment research desk · Amazon product capital
Allocate inventory capital with Wall Street rigor.
Big Sky ROI is where serious operators come for product investment advice— conviction scores, risk-adjusted ROI, position sizing, and desk notes. Not tips. A research process you can underwrite.
Desk hurdle
≥45%
cycle ROI on inventory
Net margin floor
≥18%
after fees + ads
Factors scored
7
conviction composite
01 — Conviction board
Where the desk is deployed
Illustrative product theses scored on our seven-factor model. Scores are research composites—not guarantees of returns.
| Idea | Category | Action | Score | Est. cycle ROI | Net margin | Capital | Momentum |
|---|---|---|---|---|---|---|---|
|
Modular pet travel system
Differentiated bundle · IP optionality
|
Pet | BUY | 86 | 62% | 24% | $48k | |
|
Pro kitchen prep tool
Narrow SKU · Price power in pro niche
|
Home | BUY | 81 | 54% | 21% | $32k | |
|
B2B consumable refill pack
Repeat purchase · Lower ad tax
|
Supplies | WATCH | 72 | 48% | 19% | $22k | |
|
Seasonal outdoor accessory
High sell-through risk off-season
|
Outdoor | HOLD | 64 | 41% | 16% | $65k | |
|
Generic beauty device clone
Review wall · CPC war · No moat
|
Beauty | AVOID | 38 | 12% | 7% | $55k |
02 — Research framework
Seven factors. One underwritable score.
Every product idea is stress-tested like a deal memo—not a “hot niche” listicle.
02 · STRUCTURE
Competitive structure
Share concentration, review barriers, brand incumbents, and private-label headroom. Crowded + paid-only traffic = short thesis.
03 · MARGIN
Margin structure
Landed COGS, FBA, referral, returns, and realistic ACOS. We model contribution after the full Amazon tax stack.
04 · CAPITAL
Capital intensity
MOQ, cash conversion cycle, storage exposure, and how long capital is trapped before free cash emerges.
05 · OPS
Operational risk
Supply concentration, QC failure modes, hazmat, size-tier traps, and compliance landmines that wipe margin.
06 · MOAT
Brand & moat optionality
Differentiation path: design, IP, bundles, consumables, content, and whether price power can expand over time.
07 · EXIT
Exit liquidity
Can you sell the brand, liquidate inventory, or pivot SKUs without a fire sale? Liquidity is a first-class risk factor.
COMPOSITE
Product Conviction Score
Weighted 0–100 composite mapped to BUY / WATCH / HOLD / AVOID. Used on the board and in desk notes—always with scenarios.
HURDLE
Capital deployment gate
Ideas that fail cycle ROI ≥45% or net margin ≥18% under base case do not get full capital—period. Exceptions require a written thesis.
03 — How capital gets deployed
From idea to position size
1
Screen
Kill 90% with structure, fees, and demand base rates before deep work.
2
Model
Full unit economics + inventory capital model under bull/base/bear.
3
Score
Seven-factor conviction composite and explicit risk flags.
4
Size
Position size from conviction, liquidity, and cash runway—not hope.
04 — Capital model
Underwrite the inventory bet
Interactive desk model. Adjust assumptions; we grade the deployment against institutional hurdles.
Desk output
—
Cycle ROI on inventory capital
Inventory capital
—
Cycle profit
—
Net margin
—
Profit / unit
—
Annualized ROI
—
BE vs capital*
—
Adjust assumptions to grade this deployment.
*Simplified model: capital ≈ COGS × units. Does not include tooling, samples, or working-capital buffers.
05 — Featured theses
How we write it up
Short investment memos—what we like, what can kill the trade, and how we’d size it.
Pet travel system — long inventory
BUY · 86Thesis: Durable demand (travel + pet ownership), room for a modular bundle that lifts AOV, and a path to branded content moat. Competition is fragmented; review barriers are real but surmountable with a 12–18 month plan. Kill switches: freight spike + tariff stack that compresses contribution below $6/unit; ACOS stuck above 28% after month 6.
Cycle ROI
62%
Net margin
24%
Position
$48k
Beauty device clone — pass
AVOID · 38Thesis rejected: Category is a paid-traffic arms race with entrenched review density. Gross looks fine on a naive spreadsheet; after realistic ACOS and returns, capital earns single-digit cycle ROI. Lesson: Margin structure without competitive structure is a trap. We do not buy “hot” categories—we buy underwritable economics.
Cycle ROI
12%
Net margin
7%
Position
$0
06 — Desk note
This week’s capital letter
Desk note · July 2026
Stop buying revenue. Start buying free cash from inventory.
Most Amazon “research” optimizes for vanity: search volume, BSR screenshots, competitor count. That is not investment analysis. Investment analysis asks whether a dollar of inventory capital returns more than its opportunity cost after the full fee and ad stack—and how that path breaks.
This month we are raising the weight on exit liquidity and capital intensity in the composite score. Storage and tariff scenarios have made “big first PO” strategies look smart on top-line and fragile on cash. Prefer SKUs that can prove contribution with a smaller pilot, then scale.
Use the capital model on this page. If your idea only works at heroic ACOS assumptions, it is not an idea— it is a hope. Hope is not a position.
07 — FAQ
Straight answers
What is Big Sky ROI?
An investment research desk for Amazon product capital allocation. We publish frameworks, conviction scoring, capital models, and desk notes so operators can underwrite inventory like a portfolio—not chase niches.
Is this securities or stock market advice?
No. We focus on e-commerce product and inventory decisions. Big Sky ROI is not a registered investment adviser and does not provide advice regarding stocks, bonds, funds, or other securities.
What is your hurdle rate?
Base case: cycle ROI on inventory capital ≥45% and net margin after Amazon fees, ads, and other costs ≥18%. We annualize against hold period and stress ad inflation and COGS shocks.
How should I size a position?
Size from conviction score, cash runway, and exit liquidity—not from MOQ pressure. High-conviction ideas can take a larger share of deployable capital; crowded, ad-dependent ideas stay small or zero until structure improves.
Do you sell products or only research?
The desk is research-first. Product and partnership surfaces may evolve; the permanent product is judgment—how to allocate capital under uncertainty on Amazon.
Run your next product like a deal.
Start with the capital model and methodology. When you need the full living business plan— forecast, story, brand, decisions—use Founder OS (Catalyst88). Ops systems sit on Parsimony.
Research disclaimer: Content on Big Sky ROI is for educational and informational purposes only. Illustrative product theses, scores, and model outputs are not offers, solicitations, or guarantees of performance. E-commerce results depend on execution, market conditions, fees, advertising, and factors outside our control. We do not provide legal, tax, or securities investment advice. Big Sky ROI, LLC · 30 N Gould St, Suite R, Sheridan, WY 82801.