Suppose there are two agents $A$ and $B$ with utilities $u_A = x_A + y_A - \tfrac{m}{2}(x_A - y_A)^2, \qquad u_B = x_B + y_B,$ where $x_i$ and $y_i$ are the amounts of goods $X$ and $Y$ consumed by agent $i \in \{A,B\}$. The total endowments are $x$ and $y$. Initially $A$ owns the entire endowment of $Y$ and $B$ owns the entire endowment of $X$. Then $A$ will voluntarily transfer a positive amount of $Y$ to $B$ if