In 2006, Hendry said that Friedman was guilty of "serious errors" of misunderstanding that meant "the t-ratios he reported for UK money demand were overstated by nearly 100 per cent", and said that, in a paper published in 1991 with Neil Ericsson, he had refuted "almost every empirical claim ... made about UK money demand" by Friedman and Schwartz.
Godine 2006., Hendry je izjavio da je Friedman kriv za "ozbiljne greške" nerazumijevanju da su spomenuti "T-omjeri prijavljeni za UK novcem bili precijenjeni za gotovo 100 posto", te je rekao, u članku objavljenom 1991. godine skupa s Neilom Ericssonom, te da odbija "gotovo svaku empirijsku tvrdnju o potražnji za UK novcem "Friedmana i Schwartzove.