This thesis studies different aspects of firm decisions by using a dynamic model. I estimate a dynamic model of the firm based on the trade-off theory of capital structure that endogenizes investment, leverage, and payout decisions. For the estimation of the model I use Efficient Method of Moments (EMM), which allows me to recover the structural parameters that best replicate the characteristics of the data. I start analyzing the question of whether target leverage varies over time. While this is a central issue in finance, there is no consensus in the literature on this point. I propose an explanation that reconciles some of the seemingly contradictory empirical evidence. The dynamic model generates a target leverage that changes over time and consistently reproduces the results of Lemmon, Roberts, and Zender (2008). These findings suggest that the time-varying target leverage assumption of the big bulk of the previous literature is not incompatible with the evidence presented by Lemmon, Roberts, and Zender (2008). Then I study how corporate income tax payments vary with the corporate income tax rate. The dynamic model produces a bell-shaped relationship between tax revenue and the tax rate that is consistent with the notion of the Laffer curve. The dynamic model generates the maximum tax revenue for a tax rate between 36% and 41%. Finally, I investigate the impact of financial constraints on investment decisions by firms. Model results show that investment-cash flow sensitivity is higher for less financially constrained firms. This result is consistent with Kaplan and Zingales (1997). The dynamic model also rationalizes why large and mature firms have a positive and significant investment-cash flow sensitivity.

O presente estudo objetiva investigar a materialidade do rating de crédito sobre as decisões de estrutura de capital, uma vez que diferentes níveis de rating podem representar melhores ou piores condições para a captação dos recursos externos necessários ao financiamento empresarial. A hipótese rating de crédito-estrutura de capital sugere que, após um rebaixamento no rating, as empresas adotem um perfil mais conservador nas decisões de estrutura de capital visando restabelecer as condições que possibilitem a recuperação do rating anterior. Essa relação foi estudada por meio da análise do impacto das reclassificações do rating sobre o balanceamento da estrutura de capital ao nível-alvo de endividamento de empresas latino americanas não-financeiras com algum rating designado no período 2000- 2014. Os resultados evidenciam que muitos dos preceitos da hipótese teórica também prevalecem para as empresas latinas, principalmente quando avaliados sob a perspectiva das características institucionais da região. / This study investigates credit rating relevance on firm\'s capital structure decision-making once different rating levels may imply better or worse funding conditions. The credit ratingcapital structure hypothesis suggests that firms adopt conservative capital structure decisions after rating downgrades aiming to retrieve necessary conditions to restore a better rating. This relationship was studied by analyzing the impact of credit rating changes on target leverage balance of the capital structure of non-financial Latin American firms with a credit rating designated during the period of 2000-2014. Results show that many of the theoretical assumptions prevail for Latin American firms, especially if evaluated from a perspective of the region institutional characteristics.

O presente estudo objetiva investigar a materialidade do rating de crédito sobre as decisões de estrutura de capital, uma vez que diferentes níveis de rating podem representar melhores ou piores condições para a captação dos recursos externos necessários ao financiamento empresarial. A hipótese rating de crédito-estrutura de capital sugere que, após um rebaixamento no rating, as empresas adotem um perfil mais conservador nas decisões de estrutura de capital visando restabelecer as condições que possibilitem a recuperação do rating anterior. Essa relação foi estudada por meio da análise do impacto das reclassificações do rating sobre o balanceamento da estrutura de capital ao nível-alvo de endividamento de empresas latino americanas não-financeiras com algum rating designado no período 2000- 2014. Os resultados evidenciam que muitos dos preceitos da hipótese teórica também prevalecem para as empresas latinas, principalmente quando avaliados sob a perspectiva das características institucionais da região. / This study investigates credit rating relevance on firm\'s capital structure decision-making once different rating levels may imply better or worse funding conditions. The credit ratingcapital structure hypothesis suggests that firms adopt conservative capital structure decisions after rating downgrades aiming to retrieve necessary conditions to restore a better rating. This relationship was studied by analyzing the impact of credit rating changes on target leverage balance of the capital structure of non-financial Latin American firms with a credit rating designated during the period of 2000-2014. Results show that many of the theoretical assumptions prevail for Latin American firms, especially if evaluated from a perspective of the region institutional characteristics.

Despite the fact that a preponderance of past studies in corporate finance mainly focus on capital structure decision of firms, the problems of “what factors determine the capital structure choice of firms and how firms adjust their capital structure dynamically” are still riddling. Hence, the aim of this study is to investigate the determinants of capital structure and capital structure adjustment dynamics of banks. To this end, the study employed a quantitative research approach. Specifically, secondary data have been collected through document review of annual reports of selected banks for longitudinal/panel research design. Besides, primary data have been collected through a self- administered questionnaire distributed to the selected Chief Financial Officers (CFOs) for the cross-sectional survey research design of the study. As the method of data analysis, the study estimates both static and dynamic panel models using fixed effect and GMM estimators respectively. Besides, in analyzing the cross-sectional survey responses, appropriate statistical techniques for order-ranked and nominal/categorical items of the responses have been employed. Specifically, in the univariate analysis of survey responses, mean scores and percentage of categorical responses have been computed for order-ranked and nominal items respectively. Moreover, to test the significance of differences of mean scores of order-ranked and percentage of responses of nominal items conditional on bank characteristics, the study employed the nonparametric Mann-Whitney test and the likelihood ratio test respectively. As the result, the tax shield from interest tax deductibility, profitability and/or size of free cash flows, growth opportunities and regulatory pressure factors are found to be significant determinants of capital structure decisions, consistently in estimations of panel models and cross-sectional survey. In iii examining the capital structure adjustment dynamics, both the regression estimation and survey results revealed the tendency of banks in Ethiopia to set target capital structure and adjust towards it at a relatively faster speed of adjustment. Besides, both regression model estimation and survey results disclose the asymmetrical target capital structure adjustment of banks. To be specific, overleveraged or undercapitalized banks adjust more quickly than underleveraged or overcapitalized banks. Further, the speed of target capital structure adjustment is found to be heterogeneous across banks that differ in their absolute deviations from target capital structure, size, regulatory pressure for capital adequacy and ownership. Hence, by empirically examining the determinants and dynamics of capital structure of banks in Ethiopia, the study contributes to the existing body of knowledge on the subject under study, and/or it fills a gap in the existing reference literature on the subject. Most importantly, the study tries to untangle the capital structure issues of banks, especially the dynamics, in the context of the least developed financial system where there are no secondary market and oligopolistic banking sector. / Graduate School of Business Leadership (SBL) / D.B.L.