drop-out mechanisms (panel attrition, non-employment) and ‘initial conditions’ (base-year low pay status). This model, and … initial conditions and retention of employment are more important than the ‘survey’ selection mechanism (attrition). However …

asymmetry in R&D efficiency between firms is an important factor determining feasibility of the preemption and attrition … scenarios in competitive R&D with time to build. Scenarios of attrition and preemption games are most likely to occur when … competitors have similar R&D efficiencies. In case of largely asymmetric firms the games of attrition and preemption are very …