The economics · The cost · Element

The reward cost

What redemptions cost.

The part

What it is

At marginal cost rather than at retail value, since a reward given away costs what it costs to provide.

The distinction matters: a programme costed at retail value looks far more expensive than it is.

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.