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Strategic diagnostics

Turning complex commercial problems into decisions that move the business

Each tool decomposes a real commercial problem — the kind consultants spend weeks diagnosing — into a structured diagnostic anyone can operate. Revenue, cost, and growth decisions get made with structure instead of instinct.

Built by Nick Chang · Strategy consultant · Payments & financial services

What I do

I take the commercial problems that drive revenue, cost, and growth decisions — the kind consultants spend weeks diagnosing — and turn them into structured, interactive decision systems anyone can operate. Each tool compresses deep domain expertise into something you can run in minutes.

The evidence

Seven diagnostic tools across card payments and platform economics. Each takes a problem that usually lives inside consulting decks — and structures it into explicit inputs, testable rules, and actionable outputs. Payments is the proving ground.

Payments 6 systems
01

Issuer P&L

Where is this card portfolio making — or losing — money? Diagnoses the economics of a credit card book across transaction mix, customer behavior, and risk.

7 rulesIssuer economics
02

Co-Brand

Will this partnership actually create value — or just burn acquisition spend? Tests partner reach, deal economics, and contract structure against proven failure modes.

8 rulesPartnership strategy
03

Conversion

Is the portfolio ready to migrate — or will the switch destroy more value than it creates? Assesses readiness across network switches, upgrades, and M&A migrations.

8 rulesConversion readiness
04

Acquiring

Can this acquiring business survive margin compression — or is the model structurally broken? Diagnoses economics, distribution, and strategic position across the value chain.

9 rulesAcquiring economics
05

SME Payments

Is the SME card a real operating system — or just a payment instrument dressed up? Tests whether product architecture, go-to-market, and stickiness hold up under scrutiny.

9 rulesSME payments
06

Vertical Prioritization

Which merchant verticals deserve resources — and which will drain them for minimal return? Scores five factors across Opportunity and Effort axes to classify each vertical into actionable quadrants.

10 rulesMarket prioritization
Platforms 1 system
07

Marketplace Launch

Platform economics diagnostic

Is this vertical worth launching — or will it burn platform resources on a market that never reaches liquidity? Stress-tests demand density, supply economics, and execution readiness before committing.

9 rulesPlatform economics
What's next

Payments was the starting point — seven tools that prove the approach works on real commercial problems. The marketplace diagnostic tested it beyond payments. More domains will follow where the same conditions hold: high complexity, consequential decisions, and expertise trapped in expert judgment.

✓Methodology
→New domains

Open to conversations about payments strategy, commercial diagnostics, and making expert judgment operational — connect on LinkedIn.