RGM® Glossary · Finance

Growth Glossary — Definition

SHT COST-METHOD

Cost Method

Q: What is Cost Method?

Accounting for <20% ownership Settle what Cost Method covers first; the strategy follows from there.

Q: Why does Cost Method matter?

Cost Method earns its place when it shapes a real decision. The leverage is in correct use, not in the word itself.

Q: Where does Cost Method get used?

Teams put Cost Method to work on a spend split, a metric, or a head-to-head call. See the Dropbox walk-through above.

Q: What goes wrong with Cost Method most often?

Using Cost Method flat across every segment and showing it without context. Both make a guess look exact.

Accounting for <20% ownership A working definition from the RGM marketing glossary.

Schematic — Cost Method

Accounting for <20% ownership

Term: Cost Method
Field: Finance
Category: Finance & Unit Economics

Definition in plain terms

Keep this in mind.Treat Cost Method as a unit-economics concept with a clear scope. Two people using the term should mean the same thing.

Accounting for <20% ownership

As a finance & unit economics term, Cost Method means a unit-economics concept. Settle what it covers before the planning starts.

How operators apply it

Read that twice.There is no single setting for Cost Method. It bends to the audience, the channels, and the wider plan.

Think of Cost Method as context-bound. A small shop reads it simply; an enterprise reads it with more nuance. That is normal -- Cost Method is shaped by audience and channel mix. Read Cost Method without care and the plan wobbles; be precise and the read holds.

One rule always holds. Settle the scope of Cost Method up front, then build the plan. Get it backwards and Cost Method becomes a word everyone uses and no one shares. Look at it this way.

When it matters

One idea, plainly put.Use Cost Method when it changes a choice. If it is not driving a decision, it is vocabulary, not leverage.

Bring Cost Method in when a live choice hangs on it. In finance & unit economics work, that usually means one of three moments. Away from a decision, Cost Method is background, not a lever.

Setting budget. Cost Method points to where the next dollar should go.
Choosing a metric. Cost Method shows whether the report will hold up.
Comparing options. Cost Method adjusts a compare so the gap is honest.

Worked example

Keep this in mind.The walk-through runs Cost Method through work modeled on Dropbox, so the concept meets real constraints.

Consider Dropbox. Running a contribution-margin review, the team put Cost Method at the center of the call. With a clean baseline and one fixed definition of Cost Method, they read what moved: spend on a 4-month-payback segment was trimmed. The discipline is the lesson.

Example walk-through for Cost Method -- figures illustrative, RGM analysis
Stage	What the team did	Why it mattered
Baseline	Took a before reading on Cost Method.	A fixed point of truth.
Define	Agreed a single definition of Cost Method.	A shared definition up front.
Act	A contribution-margin review — one variable.	Only one thing moved.
Result	Spend on a 4-month-payback segment was trimmed	An outcome you can trust.

Treat the Cost Method figures as illustrative, labeled RGM analysis. Reuse the sequence, not the digits.

Failure modes to watch

Here is the short version.The errors with Cost Method are predictable: one blanket rule, no context, chasing the word, raw benchmarks. Each is avoidable.

No segments. Treating Cost Method as one number for all. Break it out before you trust it.
Bare numbers. Showing Cost Method on its own. Context is what makes it readable.
Vanity focus. Gaming Cost Method instead of the result. Tie it to business value.
Raw benchmarks. Stacking Cost Method against rivals blind. Normalize for margin, pricing, and sales cycle.

Quick answers

What is Cost Method?