in each case the labour force was projected individually by gender and fiveyear age group with the overall labour force size the sum across both genders and all fiveyear age groups estimates of gdp per capita were calculated using a modified version of the longterm growth models presented in oecd economic outlook no these growth models estimate gdp based on a standard cobbdouglas production function with the usual longterm growth determinants ie physical capital human capital potential employment and labour efficiency potential gdp across the projection period here is estimated by projecting trends and changes in the various input components with projections of the components themselves based on both longterm dynamics within the given country and on convergence patterns between countries see oecd c and johansson et al for details on the measures data and assumptions used to project the individual components