We use these expressions for computing numerically the average trading costs paid byclients across various realizations of αcoand αpewhen dealers use equilibrium strategyprofiles (blue line of Fig. 8). The expressions for AT Cpeand AT Ccowhen peripheraldealers follow the efficient strategy profile are similar, except that W (Σ∗) is replaced byW (ΣF B−) if αpe< 1/2 or W (ΣF B+) if αpe> 1/2. Expressions for W (ΣF B−) and W (ΣF B+)are given in Section B.6 of the Online Appendix and are used to derive the average tradingcosts when peripheral dealers follow the efficient strategy profile (red line in Figure 8).