In a sample of Tanzanian formal sector workers the vast majority have a desire for working longer hours in their main job, and supplement earnings through participation in informal production. Determinants of participation in informal production are examined through estimation of structural-form Logit models. A new way around the problem of measuring incomes from informal production is suggested and evaluated. The results show that participation in informal production is inversely related to

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... ome, and positively related to age. Age seems to play a very different role in the transition from work to retirement in Tanzania compared to industrialised countries. JEL classification: D13; J22