okay arvind, but its simple logic.
if product is high priced - pull strategy
if product is low priced - push strategy
How does it help Nitin in his research?
Not necessarily. Pull strategy is characterized by high spend on advertising(in all forms), while push strategy is characterized by vigorous use of supply chain, or sales force.
For example, ITC used Pull for the 'Wills cigarettes' it sells, the cigarette is priced at less than Rs.10 per unit. The brand is advertised using Wills Lifestyle apparels. Price is a different part of the package.
Since the topic of Nitin's research is very broad
MARKETING STRATEGY ADOPTED FOR SELLING DIFFERENT MOBILES, The reply is also broad. This is just a common practice across different industries.
A narrow topic would have been dealt with using an accurate answer.
Hope this answers your "questions", which don't seem to be pointing towards Nitin's topic either.