What is the CPI increase for 2018?

Related questions

1. How do you calculate CPA?
2. How much do you earn per video ad?
3. What is CPA and CPI?
4. How much money do apps make off ads?
5. How much does it cost to put an ad on Facebook?
6. Is Facebook a CPC or CPM?
7. What is CPI Cost Per Install?
8. What is WPI and CPI?
9. How much is it to advertise on Facebook?
10. What is CPM CPC CPA and CTR?

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