The data for the first two industries should be of reasonable quality, and banking is of particular interest. Ownership if dwellings in an unusual industry in which all of the valued added is imputed capital income; and it is separately identified largely for the purpose of excluding it from the productivity calculations. Public administration also raises measurement issues because in the absence of a means of measuring its output, most national account systems simply assume that output changes in line with the labor input, an assumption that labor productivity is constant over time.17 Other services is a heterogeneous collection of industries such as medical care, business services and personal services, where reliable measures of output and prices are largely unavailable. Thus, the estimate of TFP provides some insight into the severity of the measurement issues. A finding of a sustained negative trend in TFP is suggestive of potential measurement problems.