Since Bitcoin’s inception in 2008, the spotlight has increasingly been towards its underlying blockchain technology (Campbell, 2016, Yermack, 2017, Cong and He, 2019, Chiu and Koeppl, 2019, Gan, Tsoukalas, and Netessine, 2021). The introduction of smart contracts in 2015 marked a pivotal shift, transforming blockchain from a mere payment infrastructure into a cornerstone for decentralized finance (DeFi) services, a domain where decentralized exchanges (DEXs) play a critical role. The book "DeFi and the Future of Finance" by Harvey, Ramachandran, and Santoro, 2021 presents a vision of a financial system dominated by DeFi, arguing that its decentralized nature could lead to more efficient, cost-effective financial systems than traditional centralized systems. However, transitioning from potential to reality necessitates a critical examination of the underlying market structures, particularly as they pertain to trading on DEXs. By focusing on the market microstructure of DEXs, the research presented in my thesis seeks to uncover existing inefficiencies, understand their origins, and propose solutions for more effective market designs. Chapter 1 sets the stage by exploring the background and foundational principles of blockchainand DEXs, preparing the reader for a deeper dive into their complexities. Chapter 2 highlights the challenges of the current DEX infrastructure, such as exposure to arbitrage losses for liquidity providers, and evaluates the effectiveness of design changes. Empirical evidence from the Silicon Valley Bank collapse illustrates the impact of arbitrageurs on liquidity provision. In Chapter 3, the focus shifts to the mechanics of price discovery in blockchain-based trading platforms. The study delves into how DEXs’ unique infrastructure, such as gas fee bidding and priority sequencing rules, impacts trading strategies and information dissemination. We delve into the trading strategies of informed traders within DEXs, revealing a preference for high-fee bids to signal information, employing a "jump bidding" strategy to limit competition. Finally, Chapter 4 challenges the current information settings of public blockchains, highlighting their inadequacies for trading due to issues like information leakage, frontrunning, and inefficient blockspace allocation. It evaluates the introduction of private transaction pools as a remedy to these challenges, examining their effects on allocative efficiency and overall welfare. It suggests that private transaction submission pools could enhance welfare and mitigate frontrunning risk, without eliminating it. In summary, this thesis aims to bridge the gap between the theoretical promise of DeFi and the practical challenges it faces. By investigating the market microstructure of DEXs, it provides insights into the design of more robust, efficient, and equitable financial systems operating over blockchain technologies.

Made available in DSpace on 2015-12-03T18:33:06Z (GMT). No. of bitstreams: 1 Jose_Raymundo_de_Faria_Junior.pdf: 1267452 bytes, checksum: 6a478b16fd990211249d441f2100f6b4 (MD5) Previous issue date: 2014-02-18 / The objective of this research is to propose for high income Brazilian investors a model of dynamic allocation with international diversification that uses ETFs and the PMI manufacturing index. ETFs were selected from twelve countries, including the ETF equities in Brazil, EWZ. The portfolios were created with and without the EWZ and two procedures were adopted to weight the assets: (1) maximization of the Sharpe ratio and (2) allocation based on the proportion of GDP. An alternative method of selection of assets was presented, using the PMI manufacturing index as a decision filter for the allocation of the resources. The PMI is usually published on the first business day of each month, is researched in the major countries and is one of the first, if not the first, leading indicator of the economic cycle. When the PMI signaled economic growth, the portfolio consisted of a higher proportion of equities. To evaluate the performance of the proposed portfolio, it was compared to other three global portfolios that followed classical allocation strategies, and one of these was considered a benchmark. The proposed portfolio was also compared to a benchmark created exclusively with brazilian assets. The result suggests that the use of PMI as a decision filter in an active and internationally diversified portfolio using only foreign ETFs and weighted according to the techniques of Modern Portfolio Theory presented higher total return and Generalized Sharpe Ratio than the international and brazilian benchmarks. This result suggests that Brazilian and foreign investors and managers who adopt active management of their portfolios should include PMI as one of the indicators to be observed in the allocation strategy / O objetivo desta pesquisa ?? propor para os investidores brasileiros de alta renda um modelo de aloca????o din??mica com diversifica????o internacional que utiliza ETFs e o ??ndice PMI da manufatura. Foram selecionados ETFs de doze pa??ses, incluindo o ETF de renda vari??vel do Brasil, o EWZ. Foram criadas carteiras com e sem o EWZ e adotados dois procedimentos para ponderar os ativos: (1) maximiza????o do ??ndice de Sharpe e (2) aloca????o com base na propor????o do PIB. Foi apresentado um m??todo alternativo de sele????o de ativos, utilizando o ??ndice PMI da manufatura como filtro de decis??o para a aloca????o dos recursos. O PMI ?? divulgado, em geral, no primeiro dia ??til de cada m??s, ?? pesquisado nos principais pa??ses e ?? um dos primeiros, se n??o o primeiro, indicador antecedente do ciclo econ??mico. Quando o PMI sinalizou crescimento econ??mico, a carteira foi composta por maior propor????o de ativos de renda vari??vel. Para avalia????o da performance da carteira proposta, a mesma foi comparada a outras tr??s carteiras globais que seguiram estrat??gias cl??ssicas de aloca????o, sendo que uma destas foi considerada benchmark. A carteira proposta tamb??m foi comparada a um benchmark criado com ativos exclusivamente brasileiros. O resultado obtido sugere que o uso do PMI como filtro de decis??o em uma carteira ativa e diversificada internacionalmente usando somente ETFs estrangeiros e ponderados de acordo com as t??cnicas da Moderna Teoria de Portf??lio apresentou retorno total e ??ndice de Sharpe generalizado superiores ao benchmark internacional e ao benchmark brasileiro. Este resultado sugere que os investidores e os gestores brasileiros e estrangeiros que adotam a gest??o ativa de seus portf??lios poderiam incluir o PMI como um dos indicadores a serem observados na estrat??gia de aloca????o

In two unrelated papers, we examine different aspects of mutual fund performance and other issues. In the first chapter, we look at exchange-traded funds (ETFs) and how they differ from index funds in performance and tracking error. Using daily data and a more comprehensive sample than past research, we find abnormal returns associated with the ETFs are higher than the alphas of the index funds in most cases. The results are much more prevalent in funds that follow the S&P 500 than funds that do not. When examining the tracking errors, we find index funds are able to track their indexes much better than ETFs and domestic ETFs are better than ETFs that track international indexes. In our most significant finding, we find that tracking error affects fund flow in the following period. While fund flows are generally increasing for both ETFs and index funds, funds that track their respective index better increase their net assets by a larger percentage than funds that track their index less well. In the second chapter, we look at the differences in performance and characteristics of mutual funds as they relate to the manager's gender. Using a larger sample and different techniques than have been used in the past, we find some differences in our matched comparison which suggest female managers have a lower risk tolerance than males. Females also tend to hold a higher number of assets (stocks) and fewer assets in their top 10 holdings than do male managers. In, pooled regressions, we find weak, but significant evidence that current female fund managers, when analyzed as a group, show slightly lower performance than male managers. We then analyze performance within funds over time. Our most consistent result is that when changing the composition of fund management, regardless of gender, the new management has significantly greater performance than prior management. We also find some evidence, although not conclusive, that the percentage of female managers managing a fund is negatively related to the fund's performance over time. Finally, we find the determinants of abnormal returns cannot be attributed to the fund manager's gender.

This study examines the use of leveraged exchange traded funds (LETFs) within a portfolio insurance framework to reduce exposure to downside risk. Investors have learned the importance of mitigating this risk having experienced two “once in a century” events in the last 20 years with the tech crash in the early 2000s and the financial crisis in 2008. Current portfolio insurance strategies are either option based (Leland & Rubinstein, 1976) or constant proportional portfolio insurance (CPPI), (Black & Jones, 1987). The cost of option based strategies can be quite high while a CPPI strategy requires constant rebalancing. This study combines the advantages of each by using LETFs to attain the leverage options provide, while at the same time allowing a greater percentage of the portfolio to be invested in bonds since a position in LETFs relative to a typical market index magnifies equity exposure. Thus, where a standard CPPI strategy may require 50% of the portfolio to be invested in equities, using a 3x LETF only requires approximately 16.7%. Results suggest the use of LETFs within a portfolio insurance framework result in better returns, higher Sharpe, Sortino, Omega, and cumulative prospect values while reducing Value at Risk (VaR) and Excess Shortfall below VaR. This twist on the use of LETFs will be of interest to any investor concerned with mitigating downside risk while allowing participation in increasing markets.

<p>This thesis is an empirical analysis on momentum effects on the Swedish stock exchange’s sector indicesduring the period 2001 to 2009. The momentum effect is investigated by buying previous winner andshort selling previous losers with holding and formation periods over an intermediate time period (1-12month period). Our results are not coherent with previous studies conducted on the U.S market or theworld market, instead our results indicate that the Swedish stock exchange’s sector indices experience acontrarian effect over the intermediate time period. The results are adjusted for systematic risk and aresignificant on the 5%-level. Our result show that the weak form of the efficient market hypothesis isviolated and we therefore believe that a demand exists for easy and convenient investment vehicles withsector specific exposure, which could have a positive effect on the efficiency of the market.</p>

Börshandlade fonder (ETF:er) blir alltmer populära som spar- och investeringsalternativ. Antalet ETF:er och variationen av dessa ökar stadigt. Denna studie ser på ETF:er likställda aktier (ur ett värdepappersperspektiv) och syftar till att applicera momentumstrategier på den amerikanska ETF-marknaden, likt Jegadeesh och Titman (1993), för att testa sambandet mellan ETF:ers kapitalvärde och riskjusterad överavkastning, estimerat genom Jensens alfa. Med utgångspunkt från Banz (1981) som visar på samband mellan investeringar i småbolagsaktier och högre riskjusterad avkastning (än motsvarande investeringar i stora bolags aktier). Testet har baserats på portföljer sammansatta på momentum- och contrarianstrategier för att utröna om en ETFs storlek på kapitalvärde är avgörande för en ETFs avkastning. Populationen har delats upp efter kapitalvärde i grupper om 25% största respektive 25% minsta, varefter portföljer skapats med momentumvinnare och momentumförlorare inom respektive grupp. Resultaten är mångtydiga och är i en del fall i linje med forskning som stödjer teorier om sambandet mellan lågt kapitalvärde och hög riskjusterad överavkastning. I andra fall är resultatet motsatt. Dock ger de flesta observationer inte statistisk signifikans och sambandet kan därför inte styrkas statistiskt. Resultatet tyder snarare på att ett samband mellan dessa två variabler inte föreligger.

This thesis is an empirical analysis on momentum effects on the Swedish stock exchange’s sector indicesduring the period 2001 to 2009. The momentum effect is investigated by buying previous winner andshort selling previous losers with holding and formation periods over an intermediate time period (1-12month period). Our results are not coherent with previous studies conducted on the U.S market or theworld market, instead our results indicate that the Swedish stock exchange’s sector indices experience acontrarian effect over the intermediate time period. The results are adjusted for systematic risk and aresignificant on the 5%-level. Our result show that the weak form of the efficient market hypothesis isviolated and we therefore believe that a demand exists for easy and convenient investment vehicles withsector specific exposure, which could have a positive effect on the efficiency of the market.

The thesis examines the strategy of country momentum and is evaluated with 30 different country exchange-traded funds (ETFs) for the period 1996-2018. The empirical evaluation is designed to apply different formation- and holding periods with overlapping portfolios. The results show positive momentum returns in various periods and a few portfolios present a higher average return than the market. However, none of the portfolios is presenting any significant positive returns or alphas, meaning that the three hypotheses cannot be rejected. On the other hand, some portfolios have higher Sharpe ratios and Morningstar value than the market. Thus, meaning that the individual investor could prefer the momentum portfolio over the market despite the insignificant returns.

No description available.

This thesis further investigates the effectiveness of 15 variable moving average strategies that mimic the trading rules used in the study by Brock, Lakonishok, and LeBaron (1992). Instead of applying these strategies to developed markets, unique characteristics of emerging markets offer opportunity to investors that warrant further research. Before transaction costs, all 15 variable moving average strategies outperform the naïve benchmark strategy of buying and holding different emerging market ETF's over the volatile period of 858 trading days. However, the variable moving averages perform poorly in the "bubble" market cycle. In fact, sell signals become more unprofitable than buy signals are profitable. Furthermore, variations of 4 of 5 variable moving average strategies demonstrate significant prospects of returning consistent abnormal returns after adjusting for transaction costs and risk.