Economics 101: How the Economy works?

I always wonder how does the economy works and how does it balances itself. 

Why inflation occurs? Why economy crashes? Why stocks go down? 

This video makes it so easy for beginners like me to understand Economics in 30 minutes.

Three simple rules to take away in the end:
1. Don't have debt rise faster than income
2. Don't have income rise faster than productivity
3. Do all that you can to raise your productivity.