在GMAT逻辑Bible的第十二章，就为大家讲解了GMAT逻辑的数值呢百分比上可能设置的错误，大家通过阅读下文，一定能找到规律。
Chapter 12 Numbers and Percentages
The makers of the GMAT often prey upon several widely-held misconceptions:
Misconception #1: Increasing percentages automatically lead to increasing numbers.
误区1、 比例增长不等于数量增长
Most people assume that if a percentage becomes larger, the number that corresponds to that percentage must also get larger. This is not necessarily true because the overall size of the group under discussion could get smaller.
If the percentage increases, but the corresponding number decreases, then the overall total must have decreased.
Misconception #2: Decreasing percentages automatically lead to decreasing numbers.
误区2、 比例下降不等于数量下降
If the percentage decreases, but the corresponding number increases, then the overall total must have increased.
Misconception #3: Increasing numbers automatically lead to increasing percentages.
误区3、 数量增长不等于比例增长
If the number increases but the corresponding percentage decreases, then the overall total must have increased.
Misconception #4: Decreasing numbers automatically lead to decreasing percentages.
误区4、 数量下降不等于比例下降
If the number decreases but the corresponding percentage increases, then the overall total must have decreased.
In each of the first four misconceptions, the makers of the test try to lure you into making an assumption about the size of the overall total.
Misconception #5: Large numbers automatically mean large percentages, and small numbers automatically mean small percentages.
误区5、 数量大不等于比例大，数量少不等于比例小
The size of a number does not reveal anything about the percentage that number represents, unless you know something about the size of the overall total that number is drawn from.
数量的多少不会揭示任何关于数量所代表的比例，除非你知道总量。
Misconception #6: Large percentages automatically mean large numbers, and small percentages automatically mean small numbers.
误区6、 比例大不等于数量大，比例小不等于数量少
被使用去引入数字的词语： amount ,total ,quantity ,sum ,count ,tally
被使用去引入比例的词语：percent ,proportion ,fraction ,ratio, incidence ,likelihood, probability ,segment, share
当出现more likely 意思比率大于50%
当出现less likely 意思比率小于50%
Because the misconceptions discussed earlier have a predictable effect when you try to make inferences, you can use the following general rules for Must Be True questions:
1. If the stimulus contains percentage or proportion information only, avoid answers that contain hard numbers.
如果题目只含有 百分比或者 比例信息，避免那些含有数量的选项
2. If the stimulus contains only numerical information, avoid answers that contain percentage or proportion information.
如果题目只含有数量信息，避免那些包含百分比或 比例信息的选项。
3. If the stimulus contains both percentage and numerical information, any answer choice that contains numbers, percentages, or both may be true.
如果题目即包含百分比，也包含数量信息， 那么任何一个含有数量，或百分比，或者二者都有的选项可能是对的
Please keep in mind that these rules are very general. You must read the stimulus closely and carefully to determine exactly what information is present because the makers of the GMAT are experts at camouflaging or obscuring important information in order to test your ability to understand complex argumentation.
A general rule for handling Weaken& Strengthen questions paired with numbers and percentages stimuli:
To weaken or strengthen an argument containing numbers and percentages, look carefully for information about the total amount(s) ---- does the argument make an assumption based on one of the misconceptions discussed above?
仔细的寻找关于总量的信息， 看看是否这个论述做出了一个以错误概念为基础的假设。
Market and Market Shares 市场和市场份额
Market operation includes supply and demand, production, pricing, and profit.
市场运营包括 供应，需求，生产，定价 和利润
Market share is simple the proportion of a market that a company controls.
市场份额仅仅是公司所控制的市场的一部分
Like all numbers and percentages problems, market share is a comparative term, as opposed to an absolute term. Thus, many market share questions hinge on one of the Misconceptions discussed in this chapter.
Average vt. 算出…的平均数;将…平均分配;使…平衡
· vi. 平均为;呈中间色
市场份额是一个相对的概念，相反于那些绝对的概念。
许多市场份额问题 依靠上面六个中的一个错误概念建立起来。
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