Concepts
Drift
Drift is the distance between a price or its supporting context and the state you last reviewed. It tells you that something deserves attention; it does not authorize a change.
Updated
Store drift and economic drift
Store drift occurs when the live catalogue no longer matches the state used to prepare a decision. Economic drift occurs when updated exchange rates or purchasing-power observations change the context behind a target.
Keeping these separate matters: one is about the source of truth in Google Play, while the other is about the evidence used to evaluate it.
Severity is a review aid
Small movement may only need monitoring. Larger movement can justify a new pricing review, especially when it affects an important market or changes the relationship between plans.
Severity helps order attention across a large catalogue, but it should not be mistaken for a command to publish.
Recalculate, review, then decide
When drift matters, refresh the catalogue and calculate against the new state. Review the resulting difference as a new decision rather than silently carrying an old approval forward.
This keeps monitoring useful without turning market movement into automatic store mutation.