Does PhD increase salary?

Related questions

1. Is PhD better than MBA?
2. Do you get paid for PhD in India?
3. Is PhD better than Masters?
4. What is the salary for PhD?
5. How much does a professor with a PhD make?
6. Do PhD students pay tuition?
7. Do we get salary while doing PhD?
8. How much is the stipend for PhD in Germany?
9. What is the salary of PhD in India?
10. Do PhD students get paid in Germany?

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