Effective only if ...

I just finished this book, that say about the book except that if you are new to trading or any other field related to trading in any way then in that case go your way or throw your heart on a more general book.
But this book will be perfect for those working in the field of sales, real estate etc., it is a very good reminder is an effective way to acquire significant new knowledge.
It is true that you will not become an expert in negotiation with this book in hand you will be more effective in the art to determine your expectations, detect traps laid by vendors, now I am more concise to determine my purchases

I think the price of this book is not justified, will give him a psychological price between 18 and 20