Chapter 2 of Freakonomics primarily discusses the importance of strategic alliances, especially in regards to obtaining the best information to perform one's job. The chapter features Stetson Kennedy who was able to use strategic alliances to infiltrate the KKK and glean significant information from them in order to expose the way the group worked. Kennedy maintained an alliance with someone who was believable enough to be accepted by the Klan and also an alliance with a radio host in order to disseminate the information that he obtained. In doing so, he was able to assist in neutering the Klan from what it was in the early half of the 20th century.
In regards to training, the second chapter also focuses on real estate agents and their use of alliances, insider information, and precise diction to get the best possible commission from each sale. It takes time and experience for a real estate agent to be "trained" in how to word advertisements. Similarly, a successful real estate agent seeks beneficial associations with other businesses, agents, and clients in order to study how a sale can best be brokered to suit the agent, even if that means encouraging a client to lower a selling price in order to sell quickly.