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Time-Varying Causality between Research Output and Economic Growth in the US

Roula Inglesi-Lotz (), Mehmet Balcilar () and Rangan Gupta ()

No 201350, Working Papers from University of Pretoria, Department of Economics

Abstract: The main purpose of this paper is to investigate the causal relationship between knowledge (research output) and economic growth in US over 1981 to 2011. To overcome the issues of ignoring possible instability and hence, falsely assuming a constant relationship through the years, we use bootstrapped Granger non-causality tests with fixed-size rolling-window to analyze time-varying causal links between two series. Instead of just performing causality tests on the full sample which assumes a single causality relationship, we also perform Granger causality tests on the rolling sub-samples with a fixed-window size. Unlike the full-sample Granger causality test, this method allows us to capture any structural shifts in the model, as well as, the evolution of causal relationships between sub-periods, with the bootstrapping approach controlling for small-sample bias. Full-sample bootstrap causality tests reveal no causal relationship between research and growth in the US. Further, parameter stability tests indicate that there were structural shifts in the relationship, and hence, we cannot entirely rely on full-sample results. The bootstrap rolling-window causality tests show that during the sub-periods of 2003-2005 and 2009, GDP Granger caused research output; while in 2010, the causality ran in the opposite direction.

Keywords: Research Output; Scientometrics; Economic Growth; Causality (search for similar items in EconPapers)
JEL-codes: C32 Q43 Q48 (search for similar items in EconPapers)
Pages: 20 pages
Date: 2013-08
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