We employ a dynamic adjustment model (Flannery and Rangan, 2006) to investigate the determinants of capital structure and speed of adjustment (Drobetz and Wanzenried, 2006) in a panel of 85 U.S. ICT firms over the years 1990 to 2013. We estimate the capital structure using a wide range of factors commonly used in the empirical literature (growth and investment opportunities, profitability, firm size, default risk, and industry median capital structure). We expand on this literature to include two additional determinants: asset turnover, an inverse measure of firm agency costs (Morellec, et al., 2012;Ang, Cole, and Lin, 2000), and R&D activity (Aghion, et al., 2004). We find that the speed of adjustment increases with firm size, growth opportunities, and distance from the target capital structure, and decreases with default risk and agency costs. We also find that R&D expenditures and agency costs cause firms to maintain lower levels of debt. We employ four recently developed estimators in dynamic panel-data econometrics: the double-censored fractional estimator (Elsas and Florysiak, 2011), the bias-corrected least-squares dummy-variable estimator (Bruno, 2005), the iterative bootstrap-based bias correction for the fixed-effects estimator (Everaert and Pozzi, 2007), and the fixed-effects quasi-maximum-likelihood estimator (Kripfganz, 2016;Hsiao, et al., 2002). In addition, our panel-data regression results show that in the ICT sector, the leverage ratio exhibits high persistence. Moreover, it positively relates to growth and investment opportunities, firm size, capital investment, and industry median capital structure, and negatively relates to profitability and default risk.
1.conservative than that of non-ICT firms and that the equity dependence of ICT firms directly links to the ICT firms' R&D investments. Aghion, et al. (2004) using U.K. data determine that firms that report R&D more likely raise funds by issuing shares than firms that report no R&D. Moreover, this probability increases with R&D intensity. Firms that report R&D hold lower debt compared to those that do not, and debt tends to fall as R&D intensity rises. Bruinshoofd and de Haan (2005) analyze the financial behavior of a sample of North-American and Western-European firms during 1991-2002 and document that ICT firms are indeed what they are always said to be: relatively information intensive and risky firms. Do ICT firms make different financial choices than non-ICT firms? Are they "really different" (Bruinshoofd and de Haan, 2005)?Capital structure holds an important place in corporate finance studies for more than a half century, since the seminal work of Modigliani and Miller (1958). They argued, under several restrictive assumptions, that capital structure does not affect the value of the firm and the cost of capital. Theoretical developments on this issue place much emphasis on relaxing the assumptions originally made by Modigliani and Miller (1958), in particular accounting for bankruptcy costs (Titman, 1984), agency costs (Jensen and Meck...