The first lesson covers two topics: one is called separate cost accounting, and the other is about always striving to expand your supplier base so they compete against each other.
When they're bidding against each other, you don't have to waste energy playing politics or scheming with them, because they'll tear each other down internally and race to please you as the client.
You need to learn how to be the client, otherwise you won't know how to spend your money even if you have it.