The paper formulates a self-employment/paid-employment choice problem that draws upon Knight's notion that the individual responds to the risk-adjusted relative earnings opportunities in each sector. Based on a development of such choice-theoretic considerations, an econometric model is developed with the purpose of empirically examining the determinants of self-employment. The model features simultaneous determination of employment status and earnings, which allows for self-selectivity. The model is estimated using a sample of 4762 individuals from the General Household Survey for 1978. The estimation of the earnings equation enables a calculation of the self-employment/paid-employment earnings differential and the estimated probit equation for self-employment/paid-employment status facilitates the prediction of the probability of self-employment. The paper finds that there is positive selection bias in the observed earnings of employees, that the probability of self-employment depends positively on the earnings difference between the two sectors and that education and age are significant determinants of self-employment.

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This paper examines the determinants of the demand for private health insurance in the United Kingdom from 1978 to 1996 using a pseudo-cohort panel. The focus is on the impact of public and private sector quality, generational change, and past purchase on demand. The results indicate that there has been generational change in buying behaviour, that the number of senior doctors employed in the public sector impacts upon demand for the private alternative, and that there is limited impact of habit in purchase. Changes to the structure of labour contracts in the NHS may affect demand for the private alternative.

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We use data on 200,000 individuals to investigate changes in job tenure. We look at the age-tenure profile for different birth cohorts of workers and find little change for men and an improvement for women. We estimate probability models for two cuts of the tenure distribution. We find that, controlling for a set of age, demographic, educational, industrial and occupational characteristics, the proportion of workers in short jobs and longer jobs has the same path as in the aggregate (unconditional) analysis. Allowing for the effect of all these characteristics to vary with time uncovers no evidence of secular change.