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This paper investigates whether movements in index-linked government bond yields are correlated with movements in medium-term GDP growth rates in the way one might expect from theory. The paper finds that movements in UK ten-year index-linked gilts can now be seen to have been highly correlated with movements in average ten-year GDP growth (a relationship that has not been obvious until the recent recession). As theory implies should be possible, we appear to be able to infer an excellent forecast for the ten-year ahead growth rate of the economy from the yield on index-linked bonds. When we apply this model to current data, the forecast growth rate is markedly lower than that produced by approaches such as those used by the UK Office for Budget Responsibility.