Video coming soon- 01 · Context
CPA is a downstream metric. When it moves, something upstream broke.
- 02 · What I noticed
CTR → CPC → landing page CVR → offer engagement → frequency → attribution. Find what moved first.
- 03 · Hypothesis
If CTR held but CPC climbed, it's an auction problem.
- 04 · Decision
Verify tracking, compare to baseline, change one variable at a time.
A sudden change in CPA is a signal to investigate — not permission to start changing everything.


