Welcome !
This is an economical theory explaining source of state debt, profits and principles of international trade.
Please, read the chapters one by one and you will learn rules and hidden logic never taught to you at schools. You will understand, why there cannot be balanced budget, to whom we own all these debts and why it is so.
If you manage to the very end, you will become quite capable future finance minister and you will never have to ask why things are as they are. Knowledge is the key to freedom and if you manage these chapters, no politician will ever fool you again.
Good Luck !