Why did the Soviet economy stagnate?

Related questions

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3. How many countries don't have McDonalds?
4. Is Russia a single country?
5. Does the first McDonald's still exist?
6. When did Russia get McDonalds?
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Tags

1. #consumer
2. #stagnation
3. #soviet
4. #could
5. #spheres
6. #external
7. #military
8. #internal
9. #caused
10. #problems
11. #increased
12. #causes
13. #argued
14. #expenditure
15. #suggested
16. #ultimately
17. #economic
18. #union
19. #goods
20. #other
21. #rather