Cross section data D22 1 Economic growth 1 Economic growths 1 Economics 1 Firm innovation 1 Heterogeneity 1 Heterogeneous firms 1 Innovation 1 Innovative firms 1 L25 1 L26 1 L53 1 O12 1 O25 1 O31 1 Productivity 1 Services sectors 1 Simultaneity 1 Surveys 1