a) Science based regime
Industry wide anonymous interactions through
I is the set of active firms in the industry.
represents the latent evolution of
technology caused by out of industry R&D.
b) Industry wide cumulative innovation
Industry wide anonymous interactions through
where 
is the average productivity in the industry.
c) Firm level cumulative innovation
Industry wide anonymous interactions through
Supplementary source of global interactions through 
if the
scope of technological knowledge at the industry level is taken into account.
We have no tagged individual interactions!