implications of technology learning in energy economy models the transport sector report to alliance for global sustainability ags daniel a krzyzanowski socrates kypreos lukas gutzwiller leonardo barreto economics group eeg general research department ene paul scherrer institute psi october 2004 tel 41 56 3102675 fax 3102624 http eem web ch villigen 5232 switzerland acknowledgements we are greatly indebted contributions schäfer and h jacoby from center policy & industrial development massachusetts mit terms access eppa model their valuable comments suggestions remarks contribution is highly acknowledged would especially like thank prof alexander wokaun head at his insightful suggestion support our work gratefully acknowledge swiss national competence on climate nccr funded by science foundation 26 10 3 table contents 1 introduction 4 2 first approach