Why does Mcdonalds use red and yellow?

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Tags

1. #combination
2. #industry
3. #yellow
4. #emits
5. #market
6. #colours
7. #target
8. #their
9. #hunger
10. #qualities
11. #relation
12. #psychology
13. #friendliness
14. #attracts
15. #positive
16. #stimulation
17. #looking
18. #triggers
19. #appetite
20. #feelings
21. #attention
22. #happiness
23. #perfect