The ladder of investment in Europe, in retrospect and prospect.

The ladder of investment was adopted by many European (and other) regulators in the era of copper networks as a means of implementing unbundling in a way which progressively promotes competitive providers׳ infrastructure investment in fixed networks. The paper reviews the evidence of its application and effects, in comparison with the most likely alternative, argues that it probably conferred benefits. In the more recent era of transition to fibre in Europe, regulatory priorities have shifted towards promoting roll-out. Two broad approaches are identified; one continues the focus on a programme of infrastructure competition in taking fibre to the home; another, relying on fibre to the cabinet, reverses it with bitstream used as the access product. It is soon to evaluate the two approaches. [ABSTRACT FROM AUTHOR]