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This dissertation studies three topics related to different types of network effects in financial economics. The first chapter, "Of Coupons and Cargo - International Debt, Production, and Trade," quantifies the relationship between firms' supply chain networks and financing decisions. Most multinational corporations raise a significant amount of debt capital outside their home country. In contrast to prevailing evidence, access to deeper financial markets cannot explain this phenomenon in its entirety, as international debt issues carry higher spreads than securities concurrently issued domestically. Novel data on the universe of fixed income securities, subsidiary locations, and shipment-level trade flows from seventeen countries, is used to understand the drivers of international debt issuance. On the extensive margin firms raise debt in exactly those markets which play a key role in their supply chain (through subsidiaries, suppliers, or customers). Tests on the intensive margin indicate that firms adjust the face value of debt outstanding in a given country following exogenous changes in their operating exposure. These results are consistent with firms using international capital markets to hedge their exposure to fluctuations in exchange rates. The second chapter, "Did You Catch the Game Last Night? - Peer Group Effects in Sell-Side Analyst Forecasts," assesses the reaction of sell-side equity analysts to sentiment shocks, as well as how such non-financial information permeates through social networks. We identify a source of peer group influence that is plausibly orthogonal to information provision, yet nonetheless affects economic decision-making: the shock to an equity analyst of their undergraduate college football team winning the NCAA Championship Game. We find that analysts' forecasts respond positively to their undergraduate school's football team winning the NCAA final. We then show that the shock of 'winning' spreads within an analyst's brokerage, positively influencing the forecasts of their colleagues. Brokerages where the degree of this diffusion is greater have lower female representation in their analyst teams, as well as lower ESG scores. The third chapter, "Sharing is Caring? - Knowledge Diffusion in Researcher Networks," focuses on the effects of social networks in innovation. Social interactions are at the core of many economic processes, including research and development. Yet their contribution to innovation is not well understood. A novel dataset on more than 19,000 economists linked to more than one million unique research projects and fifty million tweets (#EconTwitter) is used as laboratory to explore the relationship between different social interactions and research outcomes. Results suggest that interactions play a dominant role in the idea generation phase of research and a lesser one in the context of ongoing projects. They seem to matter little for completed research projects. More socially active scholars are more productive, as measured by the number of papers written, and their working papers are more visible (i.e., downloaded more frequently). A working paper being endorsed leads to an increase in downloads by 20%. However, indicative of a trade-off in spending their valuable time, these projects are less impactful based on citation measures.

Objectives To examine the relationship between Concussion Symptom Clusters (CSCs) and return-to-play time using a representative sample of U.S. college athletes with sports-related concussions. Background Recent evidence regarding concussion symptoms have been observed to be an important element of concussion severity, and potentially a predictor of return-to-play time. However, there is a paucity of data examining the associations between Concussion Symptom Clusters (CSCs) and return-to-play time in the U.S. college athlete population. Methods Data from the 2009-2010 to 2013-2014 academic years (n=1670) were obtained from the Datalys Center for Sports Injury and Prevention Inc. database. Exploratory factor analytic methods were applied, and the resulting factors were used in multinomial regression modeling to identify associations between CSCs and return-to-play time. ResultsA 4-factor solution accounted for 48.8% of the variance and included: audio-vestibular, somatic, amnesic, and affective factor structure. Audio-vestibular symptoms were associated with increased odds of prevented participation at 7-13 days, 14-29 days, greater than 30 days, and out for remainder of season, respectively (p Conclusion Specific CSCs were significantly associated with return-to-play time in college athletes, (p<0.05).

The study collected occupational data from the 99 National Collegiate Athletic Association (NCAA) Division I membership institutions head athletic directors. The purpose of this study was to identify common professional preparation and occupational characteristics among NCAA Division I athletic directors. Through issuing an electronic survey, the current study identified common characteristics and themes among Division I athletic directors specifically within the socio-demographical background, educational background, professional experience and career progression, and career and job satisfaction. The study also provided demographic information about the participant’s institutional athletic department. The necessity of this study is not due directly to the current lack of current literature and research within the collegiate administration, rather in reference to literature examining the athletic administration occupational field. The study provides an occupational framework in regards to the career progression, training, and characteristics of NCAA Division I athletic director career field. The study’s purpose was to examine the career growth of NCAA Division I athletic directors, as well as evaluate the demographic and socio-demographics characteristics of the NCAA Division I athletic director. The research and data collected from the study’s participants provided the author the opportunity to create a profile of the athletic administration career field and more specifically, the detailed qualities sought in a NCAA Division I athletic director. The results from the study are beneficial to aspiring persons that wish to work in the field of collegiate athletics administration by correlating common occupational framework for educational requirements, professional experience and years necessary to gather the appropriate experience and also to identify an overview of the job and career satisfaction common among current NCAA Division I athletic directors. In doing so, the study utilized homosocial reproduction as its theoretical framework. The study’s results concluded that the field of athletic administration, and specifically NCAA Division I athletic directors are disproportionally white males (89% white, 90% male), and further examined the educational and professional background characteristics and experiences which lead to this occupational characteristic.

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