Estratégia de Investimento baseada em padrões descobertos por mineração de dados em séries históricas de preços diários do Indice IBOVESPA e das ações da PETROBRAS-PN (PETR4.SA)

With the increase of stakeholders and consequently increase of amount of nancial transaction the study of news investment strategies in the stock market with data mining techniques has been the target of important researches. It allows that great historical data base to be processed and analysed looking for pattern that can be used to take a decision in investments. With the idea of getting pro t more than the real indexs' gain, we propose a strategy method of transactions using rules built by algorithm classi cation. For that, diary historical data of Ibovespa index and Petrobras stocks are organized and processed to nding the most important attribute that act decisively when taking a investment decision.To test the accuracy of proposed rules, a non real portfolio management is created, showing the decisions' performance over the real index and stocks' performance. Following the proposed rules, the results show that the strategy of investment give me back a high return that Stock market's return. The exclusive characteristics of algorithms maximize the gain inside the analysed time allowing to determine the techniques' return and the number of the days necessary to double the initial investment. The best classi er applied on the time series and its use on the propose investments strategy will demand 104 days to double the initial capital

Gerenciamento de transação e mecanismo de serialização baseado em Snapshot

Pós-graduação em Ciência da Computação - IBILCE

The current financial and economic crisis: empirical and methodological issues

In this paper we describe the main causes of the recent financial crisis as a result of many theoretical, methodological, and practical shortcomings mostly according to heterodox, but also including some important orthodox economists. At theoretical level, there are problems concerning teaching and using economic models with overly unrealistic assumptions. In the methodological front, we find the unsuspected shadow of Milton Friedman’s ‘unrealisticism of assumptions’ thesis lurking behind the construction of this kind of models and the widespread neglect of methodological issues. Of course, the most evident shortcomings are at the practical level: (i) huge interests of the participants in the financial markets (banks, central bankers, regulators, rating agencies mortgage brokers, politicians, governments, executives, economists, etc. mainly in the US, Canada and Europe, but also in Japan and the rest of the world), (ii) in an almost completely free financial and economic market, that is, one (almost) without any regulation or supervision, (iii) decision-taking upon some not well regarded qualities, like irresponsibility, ignorance, and inertia; and (iv) difficulties to understand the current crisis as well as some biases directing economic rescues by governments. Following many others, we propose that we take this episode as an opportunity to reflect on, and hopefully redirect, economic theory and practice.

Response to comment on "Using ecological thresholds to evaluate the costs and benefits of set-asides in a biodiversity hotspot"

Finney claims that we did not include transaction costs while assessing the economic costs of a set-aside program in Brazil and that accounting for them could potentially render large payments for environmental services (PES) projects unfeasible. We agree with the need for a better understanding of transaction costs but provide evidence that they do not alter the feasibility of the set-aside scheme we proposed.

A comercialização de uvas finas na região de Jales – SP

A produção de uvas finas para mesa destaca-se entre as principais atividades econômicas da região noroeste do Estado de São Paulo, Brasil. Entretanto, os produtores comumente apontam os problemas relativos à comercialização da fruta como um dos mais importantes obstáculos interpostos ao desenvolvimento da fruticultura regional. Este trabalho analisa as transações entre produtores e agentes de comercialização da fruta, discutindo as estruturas de governança presentes e as razões que explicam a exposição dos produtores a comportamentos oportunísticos associados aos distribuidores. Conclui-se que produtores que desenvolvem sistemas produtivos mais especializados, ofertadores de frutas de melhor qualidade, são atendidos por agentes de intermediação também especializados e, portanto, estão menos expostos a comportamentos oportunísticos. Nestes casos, a relação entre os agentes torna-se mais efetiva e sistemática, e a estrutura de governança transita de coordenação via mercado para formas híbridas.

Relacionamento e coordenação da cadeia produtiva da mandioca no Noroeste do Paraná

The production of starch and cassava starch (Manihot esculenta) if has shown to an important business for the region the northwest of the Paraná, generating income and job for a significant agricultural producers. The production of the region is processed for industries at private capital and cooperatives of producers. The study involving agricultural producers and one of the most important cooperatives of the region (C-Vale) objectified to evaluate the relationships between cooperative and producers, and the mechanisms of coordination of the productive chain. The results had disclosed that the relationships are not harmonious, generating opportunism situations, high costs of transaction and diffidence in the operations between producers and cooperative. Also if it perceived a difficulty of coordination of the productive chain, due to lack of integration between the partners, what it affects the competitiveness and the efficiency of the sector.