Perhaps an odd suggestion for someone headed to government work, but there is an old book, easy read, first in a trilogy that everyone should read. The book is the innovators dilemma. It will help you understand industry, investement, and even the government. It is written by Clayton M. Christensen.
I recommend following the Innovators Dilemma with the Innovators Solution, and the Strategy Paradox.
Fundamentally it changes the way you look at suppliers. It also changes the way you invest.