Published as (2009) “The double bubble at the turn of the century: technological roots and structural implications”, Cambridge Journal of Economics, Vol. 33, No. 4, pp. 779-805. The link is to the original working paper, 2009. “Technological roots and structural implications of the double bubble at the turn of the century”, CERF Working Paper No. 31 Cambridge Endowment for Research in Finance, Judge Business School, University of Cambridge, U.K. April.