Previous literature provided evidence on financing constraints for investment in R&D activities due to capital market imperfections and special features of R&D investments. Moreover, it has been shown that a shift in capital structure towards more debt, results in a reduction of R&D investments....

This study tests for financial constraints on Ramp;D investment and how they differ from capital investment. To identify constraints in the access to external capital, we employ a credit rating index. Our models show that internal constraints, measured by mark-ups, are more decisive for Ramp;D...

Previous literature provided evidence on financing constraints for investment in R&D activities due to capital market imperfections and special features of R&D investments.Moreover, it has been shown that a shift in capital structure towards more debt, results in a reduction of R&D investments....