Yields of bank bonds fell, on average, by 75 basis points between early June 2014 and the start of the APP. Yields of investment-grade bonds issued by firms also fell by about 100 basis points over that same period. Studies by ECB staff attribute a significant portion of those declines to the credit easing package and the announcement of the APP.
There are 5, possibly 6, regional payment systems. Thus linking all the African economies requires at most 15 connections. 2/4  BIS - Central bankers' speeches  Building key payment infrastructure has traditionally been a direct responsibility of central banks; bilateral and multilateral cooperation among them can be a game changer. A sound cost-benefit analysis can be easily carried out.