I express my profound indebtedness to 'God' who has been the invisible source of inspiration and strength behind this work. Thanks almighty for making this day possible in my life. It gives me immense pleasure to take this opportunity to thank all those who helped me directly or indirectly in the preparation of this thesis. Today, when I am submitting this thesis, it seems as if my long cherished dream has come true. First of all, my deep sense of gratitude goes to my guide Prof. Vazir Singh Nehra, Department of Commerce, M.D. University, Rohtak who monitored this research work from the beginning to the completion. He has always shown patience, a source of motivation and inspiration. I am greatly indebted to him for constant encouragement and creative suggestions for improvement. I could not have imagined having a better advisor and mentor for my Ph.D study.