This paper examines the long-run dynamic relationship between openness, migration and economic growth for Australia and Canada through the estimation of a long-run aggregate production function for each economy using the Johansen (1988) procedure. Through the disaggregation of the capital input vector entering into each cointegrating relationship, the paper also provides new evidence concerning the importance of human capital, dwelling capital, government infrastructure capital and research and development capital for long-run economic growth. The estimates from the empirical analysis suggest that net migration, openness and integration favours the productivity and growth performance of both Australia and Canada, although the magnitude of these relationships is not large.