Channel economics · The payback · Element
The period
How long until the acquisition cost is recovered.
The part
What it is
From contribution rather than revenue, which lengthens it substantially and correctly.
Measured per channel, since customers from different channels frequently differ in spend and retention.
The smallest level
The attributes it carries
Each attribute is one of the framework’s shared types. What a date is, and how it is written, is defined once for the whole model — the note here says what it means in this particular place.