“…Therefore, contemporaneous causality assumptions are required for the output and inflation blocks of B 0 in equation , leading to four possible combinations. In the case of output there is empirical evidence that the USA is less affected by external factors than euro area countries (see, for example, Perez et al ., ; Kose et al ., ; Papanyan, ). Although Bayoumi and Swiston () suggest that a strong stand should not be taken in relation to the source of output shocks in this international context, our experiments (not shown) imply that this assumption has relatively little qualitative effect on results .…”