演繹推理論證法
    將一個具體的事例運用到一個一般性原則從而得出結論。
    論點：Demand for this product wii go up。
    論據(jù)：The price of the product is sliding.
    推理依據(jù)：Whenever prices of a product go down , demand for it rises.
    (說明：由論據(jù)“the price of the product is sliding ”推出論點“Demand for this product will go up”,這個過程是否有效取決于推理依據(jù)“whenever prices of a product go down , demand for it rises”是否成立。下面每一種論證方法都是如此)