Birmingham statistician and financial forecaster Arthur H. Gibson’s so-called ‘paradox’ came about from his detailed empirical findings that the level of bond yields (as measured by the price of British Consols) tended to follow – with a lag of around a year – the price of wholesale commodities (a measure he adopted, as he himself explained, as a proxy for what he thought was the real crux of the issue, the cost of consumable necessities for which no comparable data existed). Argument has abounded as to the phenomenon’s true explanation, ever since.