In addition, there is evidence that some of the contribution of technology gains to productivity growth is being understated; see, for example, Byrne and Pinto (2015), Byrne and Corrado (2015), and Byrne, Oliner and Sichel (2015). 13  See Hamilton and others (2015). 14  See Del Negro and others (2015).
There is now a wealth of evidence showing that the unconventional policies adopted by central banks have eased financing conditions, boosted output and stabilised inflation.15  4/8  BIS central bankers' speeches  In the ECB’s case, there was a particular question about whether our asset purchases would be effective in a bank-based economy.