"Probably the leaders in innovation in Europe would be the UK with Denmark and, maybe, Sweden high on the list."
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Many Keynesian policymakers of that time believed that you could control levels of employment through monetary policy but Phelps challenged this.
"This was never the view of the sober, thoughtful and highly intelligent Keynesians I knew in the 1960s," he says somewhat modestly.
"They were never in favor of 5 or 10 percent inflation just to get employment up."
His work in this area is often associated with that of Milton Friedman, one of the founding fathers of modern monetarism.
"We did our two papers separately. He was unaware of mine and I only became aware of his when I was dotting the i's and crossing the t's. The ideas behind our work go back to the continental theorists of the 1940s."
He actually had only a few personal encounters with Friedman, who died in 2006 aged 94.