Evandro Rodrigues de Faria

Fatores determinantes na variação dos preços dos produtos contratados por pregão eletrônico

The research was intended to evaluate which were the determinative factors in the price variation of the products bought through electronic reverse auction bidding in the UFV ( Universidade Federal de Vicosa ). To reach the aims, the relation of the price variation and the following variables were tested: number of suppliers, specificity of the assets, transaction frequency, amount purchased, opportunism of the agents, time of existence and invoicing of the winner company, and the bids amount in the dispute. Pearson Correlation and Multiple Linear Regression were carried through with the intention to explore the relations between the variables and to construct a model to measure the prices variation. The results demonstrated that the number of suppliers, the specificity of the assets, the bought amount and the frequency of the transactions had a combined explanation influence on 67.4% of the variations of the prices practiced in biddings. As a result, the public agencies must develop actions that search to maximize the effect of these variables in the dispute, in order to obtain, in this way, greater economic profits through the reduction of the prices paid in their bidding processes.

Electronic bidding in Brazilian public administration purchases

This paper intended to evaluate the determinative factors in the price variation of the purchases through e-bidding in Brazil. A survey in 195 e-bidding winners was carried through to test the relation between the price variation and representative variables of transaction-cost theory. Through analysis of correlation and multiple linear regression, the number of suppliers, the specificity of the assets, the purchased amount and the frequency of the transactions had a combined explanation influence on 67.4% of the variations of the prices. This paper concludes with a discussion about the advantages of e-bidding to reduce the expenditures on public purchases.

ANÁLISE DO Q DE TOBIN COMO DETERMINANTE DO INVESTIMENTO DAS EMPRESAS BRASILEIRAS

O trabalho teve como objetivo analisar se o q de Tobin e uma variavel explicativa dos investimentos de capital das empresas brasileiras, tendo como hipotese que as empresas com q>1 investiriam e com q<1 renunciariam a oportunidades de investimento. Foram analisados dados anuais de 190 empresas listadas na Bovespa, no periodo de 1994 a 2010. O modelo estatistico utilizado foi o metodo dos minimos quadrados ordinarios, com analise em painel. Pode-se concluir que os modelos testados nao confi rmaram que o proposto por Tobin possa ser considerado um elemento relevante na decisao de investimentos. Apesar do grande periodo de tempo utilizado na amostra, verifi cou-se que nao foram ocorrencias macroeconomicas que infl uenciaram a nao rejeicao das hipoteses nulas de validade do coefi ciente q. A inclusao de dummies de tempo nao modifi cou os resultados. Como limitacao, apresenta-se o fato de que muitas empresas nao apresentaram as informacoes completas, difi cultando a utilizacao de uma amostra maior.