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The elasticity of investment and RD leverage ratios and R&D investment are strongly negatively correlated across firms and this is not accounted for by differences in corporate taxation. Finally, the contemporaneous relationship between changes in debt levels and investment which I have previously documented (Hall 1990b and Hall 1991) is one of simultaneity, and apparently transitory, unlike the relationship between cash flow and investment.

Investment and Research and Development at the Firm Level: Does the Source of Financing Matter?