As an empirical science, economics employs theoretical models to describe economic phenomena and processes. These models are then used to generate testable propositions. Comparative statics analysis facilitates the derivation of such propositions.This book is a self-contained introduction to comparative statics analysis which is appropriate for a first year PhD course in mathematics for economists. The demands that modern economic analysis places upon the student renders an incremental approach to learning essential. This permits students' intuition to develop as mathematical tools are employed in problem solving. In this book, students learn comparative statics by doing comparative statics in progressively more sophisticated models. Repeated application of the basic technique allows the student to gain competence in comparative statics analysis with minimal distraction.