How is the cost of advertising on the site calculated?

Question

Internet advertising

Hello everyone
, plz tell me how the cost of advertising on sites is calculated? In the price lists it is written (for example, on Habré) - 400 rubles for 1000 impressions. Do I understand correctly that 1000 impressions is a web page generated 1000 times (it doesn’t matter if it was generated on the same machine (it was generated, not from the cache)) or did different users go to the site?
Or how does it work?
Thanks

Answer 1

Habr's twister tries to show different ads to one user (it's understandable, audience coverage, CTR / PM / ROI is higher),
but
if there are few advertisers, and the user watches a lot of pages, he will see your banner several times
, these several times and there are several impressions . 1000 of which cost 400 rubles

Answer 2

The number of impressions is the sum of 2 parameters, one of which is not checked in any way:
1. number of real impressions
2. cheat
For example, real: 100, cheat: +300, in your report: 400, written off: 1000r.
(also, there is a cheat limit, it is also calculated!)
The parameter being checked is only the weighted average conversion: i.e. the percentage of return on funds spent for the specified time interval under equal publication conditions.
For a "rough" conversion test (on one site) - usually 2 weeks is enough, but to get a complete picture of the "return" from the site - it is better to use 4x2 (four seasonal time periods of 2 weeks each).
From reliable services- minimum order period for advertising placement: 2 weeks.