In chapter 9 in the book lemonade war which character negotiates?

In Chapter 9 of "The Lemonade War" by Jacqueline Davies, the character Evan negotiates with his younger sister, Jessie, as they both try to outsmart each other in their lemonade stand competition. Evan presents various strategies and attempts to persuade Jessie to consider a truce or partnership, showcasing his skills in negotiation amidst their sibling rivalry. The chapter highlights their differing approaches to conflict and competition, ultimately reflecting their growing understanding of each other.