Strategic diagnostics

Turning complex commercial problems into decisions that move the business

Each tool decomposes a complex commercial decision into a structured diagnostic with inspectable inputs, rules, and outputs. The portfolio shows how judgment is designed—not whether a client adopted it.

Built by Nick Chang · Financial-services consultant · Strategy, propositions & decision systems

What I do

I turn complex revenue, cost, growth, and operating questions into structured decision systems. The inputs, assumptions, rules, and outputs stay visible so another person can inspect the judgment rather than accept a black-box answer.

The evidence

Seven diagnostic tools: six in card payments and one in marketplace economics. They demonstrate repeatable problem framing and decision-logic design; illustrative scenarios are not client cases or evidence of deployment.

Payments 6 systems

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

Co-Brand

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

8 rulesPartnership strategy

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

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

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

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

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: six tools apply the same diagnostic architecture within one domain. A seventh explores marketplace launch readiness. Together they demonstrate how the structure transfers—not client adoption or realised business results.

✓Method

→New domains

Hiring managers and collaborators: if you are evaluating Nick for financial-services strategy, propositions, business management, client journeys, or decision-system work, review the logic here and connect on LinkedIn.