Reading Comprehension (RC) | In all industrial countries, the seventies were a time of slowdown

Let me just add my 2 cents on 3rd Q.
From the line mentioned below it is clear that both rationales challenged the traditional one while the magnitude of difference was more in first one.
"The two rationales are not mutually exclusive, but the first represents agreater departure from economic orthodoxy than the second"

Hope it helps!
...

---