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EDITOR
Although highly topical, the paper by Martin et al on NHS
waiting lists illustrates the misleading policy signals that can emerge
from an inadequate analytic method.1 The paper finds little and inconsistent support for associations of prolonged waiting
times with markers of capacity, independent sector activity, or need in
the surgical specialties examined. Hard pressed policy makers might
therefore infer that increased resources will not ameliorate the
problem of NHS waiting times.
Yet an emerging economic literature, to which the authors do not refer, indicates the reverse. The key problem is that the waiting phenomenon may be the result of a subtle interaction between the demand for and supply of surgical capacity. Consequently, contemporary associations between capacity and waiting time will reflect a jumble of influences on demand and supply. A model is required that enables analysts to disentangle the effects of demand and supply.
Applying these principles