What is the difference between productivity and efficiency?

Related questions

1. What is the minimum lamp efficacy required to be considered as energy efficient?
2. Is potency equal to efficacy?
3. What is clinical efficacy?
4. What is the difference between competitive and noncompetitive antagonist?
5. What is efficacy test?
6. Is efficacy the same as efficiency?
7. What do these sacramental signs mean?
8. Why is efficacy important?
9. Do antagonists block reuptake?
10. Which is better efficiency or effectiveness?

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21. #quality
22. #between