Avaliação contingente de serviços de saneamento básico em Palmas-TO / Contingent valuation of services of basic santation in Palmas- TO

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

The services of basic sanitation have crucial importance in relation to population welfare because the absence of this kind of services contribute negatively to population healthy, environment and have some impacts on the government budget. The main aim of this thesis is to estimate the willingness to pay relative to the improvement of basic sanitation (WTP) in Palmas-TO and identify which factors are related to disposition. Specifically, it is also aimed: estimate the WTP using traditional models of binary choice and, as well, semi and non-parametric models; compare the WTP values estimated by these different methods and comparing the aggregate results with the value of the investment has done in basic sanitation in Palmas City. The estimation of the willingness to pay for improvement in basic sanitation was obtained by the valuation contingent method according Hanemann approach with elicitation technique which used close-ended questions. The econometric results showed that protest votes affected negatively the estimates of WTP because there was a reduction of the precision of the results related to them. Thus, the models which did not consider the protest votes showed better results. The average willingness- to-pay basket of services related to basic sanitation was estimated in R$ 23.08 by the logit model, in R$ 19.94 by the semi-parametric model and R$22.48 by the non-parametric model. The measure more conservative of willingness-to-pay was obtained by the semi-parametric model. The variables which affected the probability of the person in paying a value for improving his welfare were household income and scholarship level(positively) and bid value(negatively). This is implies that service of basic sanitation could be considered a normal and ordinary good. Summing the average willingness to pay estimated, the welfare improvement related to increase of quality and quantity of sewage service is R$ 8,386,046.16 to R$ 9,706,617.12. This estimated values were less than the total invested in this sector in the period 1996-2006, which was R$ 74,079,081.89. The aggregate WTP indicates that payment capacity of the people is lower to total investment and, from the results, it could be inferred that is necessary make heavy investments in infrastructure area, mainly, in collecting and sewage treatment and, this way, improving the access the people to this services. Thus, the direct benefits from the willingness-to-pay of the users of this service and the costs avoided with expand of sewage treatment service are enough to guarantee the economic viability.

ASSUNTO(S)

basic santation contingent evaluation economia dos recursos naturais modelos binários semi-parametric models non-parametric models saneamento básico avaliação contingente

ACESSO AO ARTIGO

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