Financial Management Axioms ( Please explain each very short )

1. Risk - return trade-off

2. Time value of money

3. Cash is king

4. Incremental cash flows count

5. Its hard to find really profitable projects

6. Efficient capital markets

7. The agency problem

8. Taxes bias business decisions

9. All risk is not equal

10. Ethical dilemmas are everywhere in finance

( Please explain each very short )