Competitive Analysis by Michael E. Porter
I found this book very helpful - Michael E. Porter is a great teacher and writer. Probably Competitive Analysis is the one of the best on the topic
The concepts explained in Competitive Analysis PDF book are not the simplest ones. But however, Michael E. Porter is a higly-skilled in making such kind of material easy to understand and implement in practice.
Got a PDF Kindle cversion of Competitive Analysis - I guess a hardcopy would be better. Michael E. Porter is a top-level prefessional
