In one line
Cost per engagement: what was paid, divided by the likes, comments, shares and saves it earned.
An Indore food campaign pays ₹6,000 and counts 1,500 likes and comments: its CPE is ₹4.
Campaigns count engagement differently: some include saves and shares, some only likes and comments. Two CPE figures are comparable only when they count the same things.
Agree: which interactions count and over how many days.
