Do‐it‐yourself activities are, by definition, those for which a choice must exist between doing it oneself or hiring someone else. This means they typically involve the own account production of services, but whereas it is customary to include most goods produced on own account in GDP services are conventionally excluded. In principle, however, it is possible to envisage a comprehensive and unique measure of the total final output of all the goods and services produced within an economy whether for sale or own use. Such a measure would be better than GDP as an indicator of long term changes in economic welfare, being independent of any shifts in the ratio of market to non‐market production. Moreover, it would be a homogeneous measure with clearly defined limits in contrast to improvised indices of welfare which mix economic and non‐economic variables in arbitrary and subjective ways. However, the need for a measure of market output, or something very close to it such as GDP, is still as strong as ever as soon as attention is switched from measurement of long term growth to problems associated with market disequilibria, such as unemployment and in