Die gebruikswaarde van besluitnemingsondersteuningsmodelle vir trekkervervanging in die Vrystaat

[摘要] English: The replacement of farm tractors and availability of decision support models for assistingfarmers in taking replacement decisions were studied. A literature survey, postal surveyof farmers and interviews with various persons were used to gain information on theavailable replacement models, replacement policies, information availability and farmers'decision making processes.This information was used to model the replacement decision and develop differentdecision support systems.Different replacement optimising techniques were studied. Minimum-cost models areunpractical for modelling replacement decisions. An extended version of the minimumdiscounted cost model can be used as a decision support model for advising farmers. Asimulation model for establishing replacement strategies was also developed and used todetermine optimal replacement strategies.Both models indicate an economic life for tractors in excess of 10 years. An increase inthe tax rate results in replacement at an earlier life than with lower tax rates.

[发布机构] University of the Free State