[eng] The presentation of particular stylized facts on technical change - as involving two modes of learning (from diversity and from standardization) - introduces an original analysis of the problems raised by the tension between diversity and standardization. Both economic values of diversity...

[eng] This paper explores the theoretical options and the main orientations of the « competing technologies » model of B. Arthur and P. David. Under increasing returns, competition between n technologies can lock-in in to monopoly of one of the n technologies. The model shows also that each...