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Abstract Agricultural elasticity of demand which is small and the vicariousness is low is the most different from other industrious. Therefore, when the disturbance factor is appeared, the agricultural price often get largest influence. In recent years, the global warming is not only made the weather changes extremely but also made strong influence, that made serious impact to the output of agricultural products. As the result, this research is aimed at mango, litchi, and guava those are the more popular fruits. Using supply and demand model and human weather comfort level(including Net Effective Temperature Index , Apparent Temperature (shade) Index, Heat Index, Humidex, Windchill Index, and Wet Bulb Globe Temperature Index ) were discussed the influence of climate-index to influence of the Taiwan agricultural price. The findings showed: the HMI of summer fruit is obvious, and more variation; Therefore the single forecast model reveal , the HMI significance much better than other targets. WCI the precision is not precise in test, but it is the examination winter target, but in this research I select summer fruit, therefore the winter target is not exact. Above all, the fruits belong planting in summer, because of the Saint infant phenomenon's climate make strange will create the summer fruit to get a lot of threat in the future in Taiwan.
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