This paper reviews current development of the Asian Bond Markets Initiative (ABMI) and addresses the macroeconomic effects of credit guarantee schemes through the Credit Guarantee Investment Facility (CGIF) along with the ABMI. The findings from international macroeconomic simulations include that (i) even though East Asian financial cooperation upgrades some countries’ credit fundamentals, it helps increase both the corresponding countries’ real GDP and East Asia’s regional real GDP, and (ii) this effect becomes greater as credit rating upgrade happens to more ASEAN+3 member countries in East Asia. These results strongly recommend that ASEAN+3 efforts along with the ABMI should move toward building local currency bond markets on the existing achievements. For the ABMI to be more effective, moreover, the importance of regional prudential supervision and regional market infrastructure is given with greater emphasis.