This doctoral dissertation examines the impact of product market competition on the cash flow investments and risk. The dissertation is comprised of three essays. First essay investigates the link between a firm's competitive environment and the ratio of idiosyncratic volatility to systematic volatility. I postulate that competition has a higher effect on idiosyncratic volatility than the systematic volatility for two reasons. First, market power works as a tool that passes on firm-specific cost shocks to customers but is irrelevant to passing on the industry-wide cost shocks. Second, firm's competitive advantage relative to its peers in the industry is affected by changes in firm-specific costs rather than by the industry-wide costs. The effect of firm-specific costs on competitive advantage is expected to be larger when there are many rivals in the industry. Accordingly, I find that competition increases the idiosyncratic volatility more significantly than the systematic volatility. Given that R-square is a function of these two risks, the results show that economy-wide competition plays a role in explaining the R-square. The second essay examines the effect of product market competition on cash-flow investments. Given that competition increases financial constraints, as indicated by several recent studies, I claim that competition may prevent firms from undertaking valuable investments using the cash flow. The results are consistent with this prediction as I find that competition exacerbates the effect of financial constraints and reduces the investment of cash flow in valuable projects. I also show that the financial constraints of competition, and not the competition per se, perform a major disciplinary role of reducing overinvestment. Therefore, our perception to competition as a corporate governance tool could have been overestimated. The third essay investigates the effect of product market competition on the exposure of firms' return to consumption fluctuation (C-CAPM beta). This kind of exposure is considered a main determinant of the security's systematic risk. I find that higher competition reduces C-CAPM beta. This result is attributed to the output reaction by firms in competitive industries to consumption fluctuation as opposed to price reaction by firms in low-competition industries. The findings of this essay are in contrast to prior studies that document a positive association between competition and systematic risk. While these studies applied standard CAPM to measure the systematic risk, my study applies Consumption-CAPM.
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