Hi Hiren,
Thank you for this question. I'd like to think this book can help people from other countries. I am the author, so I know that many readers in English speaking countries around the world have bought the book, beginning when it was first published in 1995. The theory the book is based on has decent research support for cultures outside the USA. The strategies (Chapters 4 and 5) ought to work regardless of pay--in fact, given low pay, some of the strategies may be even more necessary than they are in the US.
Congratulations on your success as a writer. You must know quite a bit about making your passion your profession from personal experience alone!