The aliasing effect, the Fejer Kernel and temporally aggregated long memory processes

This paper derives the spectral density function of aggregated long memory processes in light of the aliasing effect. The results are different from previous analyses in the literature and a small simulation exercise provides evidence in our favour. The main result point to that flow aggregates from long memory processes shall be less biased than stock ones, although both retain the degree of long memory. This result is illustrated with the daily US Dollar/ French Franc exchange rate series.

Spectral properties of temporally aggregated long memory processes

This paper derives the spectral density function of aggregated long memory processes in light of the aliasing effect. The results are different from previous analyses in the literature and a small simulation exercise provides evidence in our favour. The main result point to that flow aggregates from long memory processes shall be less biased than stock ones, although both retain the degree of long memory. This result is illustrated with the daily US Dollar/ French Franc exchange rate series.

How much debtors' punishment?

This paper investigates how the bankruptcy exemptions applied by the Personal Bankruptcy Law in each American state a§ect the aggregated level of individuals and small businessesí loans. Higher levels of bankruptcy exemptions imply in a lenient rule, motivating debtors to Öle for bankruptcy, what makes lenders worsen the terms of credit. On the other hand, lower levels of exemptions imply in a harsh punishment to debtors, inhibiting their demand for credit fearing a possible bankruptcy by bad luck. ConÖrming the theoretical claims, empirical tests show the existence of a non-monotonic shape in the relationship between the bankruptcy exemptions and the amount of credit to individuals and small businesses, where the optimal level of exemptions should be neither too high nor too low. Since the majority of the states in U.S. do not apply the optimal level, an intervention that brings the exemption level closer to the optimal one can be credit and welfare enhancing.

A note on Chambers's "long memory and aggregation in macroeconomic time series"

Chambers (1998) explores the interaction between long memory and aggregation. For continuous-time processes, he takes the aliasing effect into account when studying temporal aggregation. For discrete-time processes, however, he seems to fail to do so. This note gives the spectral density function of temporally aggregated long memory discrete-time processes in light of the aliasing effect. The results are different from those in Chambers (1998) and are supported by a small simulation exercise. As a result, the order of aggregation may not be invariant to temporal aggregation, specifically if d is negative and the aggregation is of the stock type.

Análise da proposta de reforma tributária (EC nº 42) do governo Lula

As mudanças tributárias realizadas na última década priorizaram o ajuste fiscal com uma elevação da carga de impostos que saltou de 27% do PIB, em 1994, para cerca de 36% do PIB, em 2003. Esse aumento da carga tributária esteve associado principalmente ao aumento das contribuições sociais cumulativas. Além dessa crescente cumulatividade, outras características que têm marcado o sistema tributário brasileiro são a complexidade e os conflitos federativos que alimentam uma profunda guerra fiscal entre Estados e municípios. Em abril de 2003, o Governo Lula encaminhou ao Congresso Nacional uma ampla proposta de reforma tributária, tendo como objetivos principais (i) simplificar o sistema tributário brasileiro, (ii) reduzir a cumulatividade dos tributos e (iii) acabar com a guerra fiscal. Apesar do reconhecimento generalizado de que a carga tributária brasileira é excessivamente elevada, o governo federal limitou-se a assumir o compromisso de não promover aumentos adicionais de impostos. Inserido nesse contexto, este estudo analisa (i) o quadro fiscal brasileiro, procurando identificar as reais restrições que impedem a redução da carga tributária brasileira e (ii) as medidas tributárias propostas pelo Governo Lula, destacando suas implicações sobre o desenvolvimento econômico brasileiro.

Regiões metropolitanas brasileiras: índices de diferenciação

The research investigates the differences among Brazilian metropolitan regions, in what concerns to the composition of their productive and occupational structures. This investigation aims to allow the observation of the differentiated stages of metropolitan development, in comparing the spaces among themselves and in measuring the intensity of the differences. This work intends to subsidize the analysis of the private and public firms location choices, and on the other hand, to point out the necessities of public intervention aiming regional development. The analysis is accomplished with the help of differentiation regional indexes, calculated from information aggregated in special tabulations, in order to accomplish the specifics objectives of this research.

Exclusão social: gestão estratégica de pessoas em duas subsidiárias de uma empresa multinacional

The present study of case empirically investigates the existence of indicators that suggest the social exclusion preoccupation from the organizations with a strategic management of human resources focus. The objects of study are two subsidiaries of a multinational enterprise in emergency and first-aid services area. One of them is Portuguese and the other is a Brazilian one. This exploratory research has used a sectional way with a longitudinal perspective, since it has considered a specific verified data referring to 2004 and 2005 years, beyond the deeper interviews with actual managers to an evaluation of these studied perception and its authentication. Our indicators identification sources were principally the individual and social rights and duties broaching and the fundamental guarantees disposed in the Brazilian and Portuguese Constitutions as such as the European Constitution project. The results appoint to great differences of management between both subsidiaries, being the Brazilian one closer to our research proposes, as such as suggest us that the human resource areas, still acting in an instrumentalist way, establish a great barrier to better practices in social inclusion and they would be unprepared for a management with the focus in the employees. Although our study has been realized in a specific activity enterprise, we believe that our results can stimulate the realization of other investigations with the same objectives. In this way, we contribute to a better comprehension of the social exclusion causes and the organizations participations in this process.

Estratégias de internacionalização: investimentos diretos externos de multinacionais brasileiras

With the improvement of the international trade on the last decades, the Brazilian firms are searching to operate beyond the national borders in order to guarantee its presence on the key markets. The dissertation aimed to analyze the motivations and the strategies of internationalization implemented by the firms: Petrobras, Vale, Embraer, Gerdau and Marcopolo as well as determine the existence of a dominant strategy. In order to do that, Dunning¿s eclectic paradigm and the strategies of internationalization supported by him were revised along with the main literature from Brazilian authors on the internationalization process of the selected firms. The comparative analysis between the strategies of internationalization selected and the industrial sector, origin of capital and the preferred mode of entrance on the markets were done through an exploratory research, with a qualitative character and collection of secondary data from the internationalization process of the firms. At the end of this research, it was possible to identify that each firm had adopted a predominant strategy however it was also possible to observe that new strategies were aggregated in complementation of the previous one. Besides that, no evidence was found between the predominant strategy of internationalization and the origin of the capital neither with the preferred mode of entrance.

Mensuração de Capacidade Tecnológica no Contexto de Industrialização Recente: Uma Breve Reflexão Crítica Sobre Taxonomias e Evidências de Pesquisas Recentes

This dissertation aims at examining empirical evidences obtained in the light of taxonomies and strategies for measuring firms technological capabilities and innovation in the context of developing countries, motivated by the fact that debates and studies directed to innovation has been intensified, for the last thirty years, by the recognition of its vital and growing importance to the technological, economic, competitive and industrial development of firms and countries. Two main tendencies can be identified on this debate. At one side, it¿s the literature related to the developed countries logic, whose companies are, in majority, positioned at the technological frontier, characterized by the domain of innovative advanced capabilities, directed to its sustaining, deepening and renewal. At the other side, there are the perspectives directed to the developing countries reality, where there is a prevalence of companies with deficiency of resources, still in process of accumulating basic and intermediate technological capabilities, with characteristics and technological development trajectories distinct or even reverse from those of developing countries. From this last tradition of studies, the measuring approaches based in C&T indicators and in types and levels of technological capabilities stand out. The first offers a macro level, aggregated perspective, through the analysis of a representative sample of firms, seeking to the generation of internationally comparable data, without addressing the intraorganizational specificities and nuances of the paths of technological accumulation developed by the firms, using, mostly, R&D statistics, patents, individual qualifications, indicators that carry their own limitations. On the other hand, studies that examine types and levels of technological capabilities are scarce, usually directed to a small sample of firms and/or industrial sectors. Therefore, in the light of the focus and potentialities of each of the perspectives, this scenario exposes a lack of studies that examine, in a parallel and complementary way, both types of strategies, seeking to offer more realistic, consistent and concrete information about the technological reality of developing countries. In order to close this gap, this dissertation examines (i) strategies of innovation measurement in the contexts of developing countries based on traditional approaches and C&T indicators, represented by four innovation surveys - ECIB, PINTEC, PAEP and EAI, and, (ii) from the perspective of technological capabilities as an intrinsic resource of the firm, the development of which occurs in a cumulative way and based on learning, presents and extracts generalizations of empirical applications of a metric that identifies types and levels of technological capabilities, through a dynamic and intra-firm perspective. The exam of the empirical evidences of the two approaches showed what each one of the metrics are capable to offer and the way they can contribute to the generation of information that reflect the technological development of specific industrial sectors in developing countries. In spite of the fact that the focus, objective, perspective, inclusion, scope and lens used are substantially distinct, generating, on a side, an aggregated view, and of other, an intra-sector, intra-organizational and specific view, the results suggest that the use of one doesn't implicate discarding or abdicating the other. On the contrary, using both in a complementary way means the generation of more complete, rich and relevant evidences and analysis that offer a realistic notion of the industrial development and contribute in a more direct way to the design of corporate strategies and government policies, including those directed to the macro level aspects just as those more specific and focused, designed to increment and foment firms in-house innovative efforts.

Um estudo de caso sobre a entrada da Petrobrás no retail norte americano

Esta dissertação objetiva compreender como a entrada da companhia no mercado de retail Norte Americano poderia contribuir com sua estratégia. Acredita-se que sendo o mercado Norte Americano o maior consumidor e também importador mundial de gasolina (derivado de petróleo de alto valor agregado) este seria um mercado relevante para a expansão dos negócios da Petrobras. Dentre as principais razões destacamos: o tamanho deste mercado consumidor, vantagens logísticas, margens atrativas, diversificação do portfólio da companhia e; um posicionamento estratégico no sentido de ser reconhecida internacionalmente. Dentre os resultados desta dissertação pode-se destacar que o mercado de downstream norte americano é atrativo e, assim sendo, a Petrobras, como companhia de petróleo regional objetivando tornar-se uma grande empresa internacional de petróleo, deva estudar a possibilidade de entrar no mercado de retail norte americano. Não foram detectadas barreiras suficientemente fortes no que tange ao comportamento predatório nem custos afundados ou integração vertical que impeça a entrada de novos competidores. Finalmente, ao observar-se os resultados da fronteira eficiente, tem-se que não existe uma “melhor” opção de carteira e, caberá a companhia definir o quão exposto ao risco deseja estar e, ao mesmo tempo, qual o retorno mínimo aceitável.

O efeito manada nos fundos de investimento no Brasil: um teste em finanças comportamentais

Utilizando-se de uma amostra de movimentações diárias de fundos de investimento em ações, multimercados e renda fixa no Brasil, por meio de uma metodologia baseada na direção das captações líquidas de um grande número de fundos de investimento, agregados em grupos de investidores de acordo com o porte médio de seu investimento (ricos e pobres), foi encontrada forte evidência da ocorrência de efeito manada de forma heterogênea entre diferentes grupos de investidores, sendo que a intensidade do efeito manada varia de acordo com o porte do investidor, tipo de fundo e com a época. Também foi testado um viés de heurística: a ancoragem de preço, que supõe que após uma nova máxima ou mínima histórica nos preços das ações, haverá uma movimentação anormal de investidores, que acreditam ser este evento um indicador sobre os preços futuros. Encontrou-se evidência de que este fenômeno ocorre em diferentes tipos de fundos de investimento, não apenas os fundos de investimento em ações, e que tem maior impacto quando há uma nova mínima do que quando há uma cotação recorde no índice Ibovespa. Entretanto, o poder de explicação deste viés sobre o efeito manada é pequeno, e há uma série de variáveis ainda não exploradas que têm maior poder de explicação sobre o efeito manada. Desta maneira, este estudo encontrou evidências de que os pressupostos de finanças comportamentais de que a informação e as expectativas dos investidores não são homogêneas, e que os investidores são influenciáveis pelas decisões de outros investidores, estão corretos, mas que há fraca evidência que o viés de heurística de ancoragem de preço tenha papel relevante no comportamento dos investidores.

Synchronization versus staggering of price changes in Brazil

Apesar de diversos modelos assumirem que os preços não se ajustam sincronizadamente, tanto a evidência empírica quanto a teórica são ambíguas. Este trabalho tem por objetivo identificar o comportamento dos reajustes de preço, analisando uma extensa base de dados brasileira. Foi encontrada uma evidência de escalonamento, mas quanto mais agregado são os dados, mais perto da sincronização perfeita eles estão. A economia brasileira também mostrou um alto grau de heterogeneidade, tanto na frequência quanto na sincronização dos ajustes de preço entre os produtos, as quais ainda variam com a taxa de inflação.

Estimativas para a elasticidade-preço da demanda por produtos siderúrgicos no Brasil

Essa dissertação apresenta estimativas para a elasticidade-preço da demanda por aço no Brasil, a partir de dados agregados e desagregados da indústria siderúrgica. Os resultados das estimativas a partir do painel com dados desagregados sugerem que existe um viés de agregação nas estimativas já realizadas a partir de dados agregados, e esse viés subestimaria a elasticidade-preço do setor siderúrgico. Com a finalidade de comparar as relações entre as elasticidades-preços de curto e longo prazo foram estimados painéis heterogêneos dinâmicos, através de estimadores Mean Group (MG) e Pooled Mean Group (PMG). É importante ressaltar que, de acordo com o conhecimento do autor, este é o primeiro estudo a usar estimação em painel para estimação da elasticidade-preço da demanda por produtos siderúrgicos no Brasil, dessa forma, controlando a estimativa pela heterogeneidade entre os tipos de aço.

Three essays on education from the perspective of the economics of public setor

This work consists of three essays organized into chapters that seek to answer questions at first sight unrelated, but with one common denominator, which is the scarcity of public resources devoted to education, overall, especially in lower education. . The first chapter deals with the scarcity of resources devoted to education in a context of population aging. Two hypotheses were tested for Brazilian municipalities on the relationship between the aging of the population and educational expenditure. The first, already proven in the literature, is that there is an intergenerational conflict for resources and the increase of the share of elderly in the population reduces the educational expenditure. The second, proposed here for the first time, is that there should be reduction of competition for resources if there is a relationship of co-residence between young and old. The results indicated that an increase in the share of elderly reduces the educational expenditure per youth. But the results also illustrate that an increase in the share of elderly co-residing with youth (family arrangement more common in Latin American countries) raises the educational expenditure, which reflects a reduction of competition for resources between generations. The second chapter assesses the allocative efficiency of investments in Higher Education. Using the difference between first-year and last-year students’ scores from Enade aggregated by HEI as a product in the Stochastic Production Function, is possible to contribute with a new element in the literature aimed at estimating the production function of education. The results show that characteristics of institutions are the variables that best explain the performance of students, and that public institutions are more inefficient than the private ones. Finally, the third chapter presents evidence that the allocation of public resources in early childhood education is important for a better future school performance. In this chapter was calculated the effects of early childhood education on literacy scores of children attending the 2nd grade of elementary school. The results using OLS and propensity score matching show that students who started school at the ages to 5, 4, and 3 years had literacy scores between 12.22 and 19.54 points higher than the scores of those who began school at the ages 6 years or late. The results also suggest that the returns in terms of literacy scores diminish in relation to the number of years of early childhood education.

Forecasting Brazilian inflation by its aggregate and disaggregated data: a test of predictive power by forecast horizon

This work aims to compare the forecast efficiency of different types of methodologies applied to Brazilian Consumer inflation (IPCA). We will compare forecasting models using disaggregated and aggregated data over twelve months ahead. The disaggregated models were estimated by SARIMA and will have different levels of disaggregation. Aggregated models will be estimated by time series techniques such as SARIMA, state-space structural models and Markov-switching. The forecasting accuracy comparison will be made by the selection model procedure known as Model Confidence Set and by Diebold-Mariano procedure. We were able to find evidence of forecast accuracy gains in models using more disaggregated data