What is the difference between efficacy effectiveness and efficiency?

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Tags

1. #success
2. #contrary
3. #efficiency
4. #efficacy
5. #meeting
6. #effect
7. #spent
8. #resources
9. #getting
10. #achieving
11. #produce
12. #amount
13. #targets
14. #achievement
15. #things
16. #desired
17. #ability
18. #focus
19. #given