At present the Hollywood Restaurant has only standard-height tables. However, many customers come to watch the celebrities who frequent the Hollywood, and they would prefer tall tables with stools because such seating would afford a better view of the celebrities. Moreover, diners seated on stools typically do not stay as long as diners seated at standard-height tables. Therefore, if the Hollywood replaced some of its seating with high tables and stools, its profits would increase.
The argument is vulnerable to criticism on the grounds that it gives reason to believe that it is likely that
some celebrities come to the Hollywood to be seen, and so might choose to sit at the tall tables if they were available
the price of meals ordered by celebrities dining at the Hollywood compensates for the longer time, if any, they spend lingering over their meals
a customer of the Hollywood who would choose to sit at a tall table would be an exception to the generalization about lingering
a restaurant's customers who spend less time at their meals typically order less expensive meals than those who remain at their meals longer
with enough tall tables to accommodate all the Hollywood's customers interested in such seating, there would be no view except of other tall tables
或者说,这种一增一减型的选项只能用于填补逻辑漏洞很大的assumption题里,而不能用于计划题里。譬如”某钢铁制造工厂倾销老库存,但他还是赚钱了,问你assumption?“我们可以说因为他价格下降了,但销量提升了,因为我们作为外人是在合理的范围推测可能的条件,去弥补这个逻辑漏洞。但如果有道题说“某钢铁制造工厂倾销老库存,他们预期这样就会赚钱”。我们当然不能说因为价格下降销量提升,因为在计划里我们是计划者,这种推测是不严谨的,我们要的是确切的东西。于是,我们可以说因为最近钢铁价格上涨,即使是倾销,老库存也可以卖出更高的价格。
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