I20, I21, I28
I21, J16
: General / O31 Innovation and Invention: Processes and Incentives / O32 - Management of Technological Innovation and R&D
O33, G21, I21, J24, D12, D91, C93
I38: Government Policy – Provision and Effects of Welfare Programs
I21, I25, J22, O12
C93; I21; J24
I21; I28
I21, I24, I29
I21, I25, O15