单词经济为什么是复数形式啊?

it had a market eight times larger than any competitor, giving its industries unparalleled economies of scale。

单词经济为什么是复数形式啊?

解释一下原因,不甚感激。。。。。。。。。

加个s改变词性,形容词变成了名词
http://www.etymonline.com/index.php?allowed_in_frame=0&search=ics&searchmode=none
都在上表中,有三页

suf. 表示“ ... 学; ... 术”
[构成名词后缀]
[通常用作单数]表示“…学”,“…术”,“…研究”:linguistics,physics
[常用作复数]表示“性质”,“特征”:atmospherics
[常用作单数]表示“体系”,“系统”:architectonics
[常用作复数]表示“实践”,“活动”:acrobatics,histrionics
Words ending with stics, the most common words first
52 words found.
52 words found.
52话发现。
7
7
bustics
bustics
fustics
fustics
mastics
胶粘剂
mystics
神秘主义者
rustics
乡下人
8
8
caustics
焦散
clastics
碎屑岩
ekistics
规划学
elastics
橡皮筋
eristics
特征
gnostics
诺斯替派
plastics
塑料
spastics
痉挛
9
9
acoustics
声学
acrostics
离合诗
agnostics
论者
autistics
自闭症患者
domestics
女佣
logistics
物流
monastics
僧侣
telestics
telestics
10
10
anapestics
anapestics
ballistics
弹道学
cladistics
分支系统学
encaustics
encaustics
fantastics
着,
gymnastics
体操
heuristics
启发式算法
onomastics
专名学
patristics
教父
statistics
统计
stylistics
文体学
11
11
diagnostics
诊断
futuristics
未来学
linguistics
语言学
nonplastics
nonplastics
prognostics
预测
scholastics
经院哲学家
slimnastics
健美操
12
12
bioacoustics
生物声学
nondomestics
nondomestics
13
13
biostatistics
生物统计学
ecclesiastics
神职人员
14
14
criminalistics
刑事学
thermoplastics
热塑性塑料
15
15
characteristics
特征
metalinguistics
语言学
paralinguistics
超语言学
psychoacoustics
心理声学
16
16
electroacoustics
电声学
sociolinguistics
社会语言学
17
17
psycholinguistics
心理语言学
The most frequently occuring words ending with stics
The first number (in bold) is the number of letters in the word, to make it easier to spot the most common words of the length you want.
The second number indicates the approximate number of times the word occurs per million words. The words occuring most frequently are shown first.
characteristics - 15, 38
statistics - 10, 32
linguistics - 11, 8
plastics - 8, 5
logistics - 9, 2
mystics - 7, 2
gymnastics - 10, 1
diagnostics - 11, 1
acoustics - 9, 1
stylistics - 10, 1

There are 42 less common words:
nonplastics
nondomestics
telestics
monastics
metalinguistics
mastics
thermoplastics
onomastics
paralinguistics
rustics
slimnastics
psycholinguistics
psychoacoustics
prognostics
sociolinguistics
spastics
patristics
scholastics
heuristics
clastics
cladistics
caustics
bustics
biostatistics
bioacoustics
ballistics
autistics
anapestics
agnostics
criminalistics
domestics
encaustics
gnostics
futuristics
fustics
fantastics
eristics
electroacoustics
elastics
ekistics
ecclesiastics
acrostics

in the names of sciences or disciplines (acoustics, aerobics, economics, etc.) it represents a 16c. revival of the classical custom of using the neuter plural of adjectives with -ikos (see -ic) to mean "matters relevant to" and also as the titles of treatises about them. Subject matters that acquired their names in English before c.1500, however, tend to remain in singular (such as arithmetic,logic).

Words ending with ics, the most common words first
625 words found.

The most frequently occuring words ending with ics
The first number (in bold) is the number of letters in the word, to make it easier to spot the most common words of the length you want.
The second number indicates the approximate number of times the word occurs per million words. The words occuring most frequently are shown first.
politics - 8, 75
characteristics - 15, 38
statistics - 10, 32
economics - 9, 29
critics - 7, 27
graphics - 8, 20
mathematics - 11, 20
physics - 7, 19
topics - 6, 19
republics - 9, 15
electronics - 11, 15
tactics - 7, 14
mechanics - 9, 9
ethics - 6, 9
clinics - 7, 8
linguistics - 11, 8
catholics - 9, 8
academics - 9, 8
classics - 8, 7
fabrics - 7, 7
dynamics - 8, 6
polytechnics - 12, 6
plastics - 8, 5
mosaics - 7, 5
athletics - 9, 5
antibiotics - 11, 5
relics - 6, 4
lyrics - 6, 4
semantics - 9, 4
genetics - 8, 3
aesthetics - 10, 3
ceramics - 8, 3
aerobics - 8, 2
fanatics - 8, 2
cosmetics - 9, 2
antics - 6, 2
mystics - 7, 2
sceptics - 8, 2
logistics - 9, 2
tropics - 7, 2
microelectronics - 16, 2
diabetics - 9, 2
pragmatics - 10, 2
italics - 7, 2
comics - 6, 2
eugenics - 8, 1
electrics - 9, 1
bishoprics - 10, 1
optics - 6, 1
clerics - 7, 1
stylistics - 10, 1
epics - 5, 1
epidemics - 9, 1
avionics - 8, 1
specifics - 9, 1
gymnastics - 10, 1
obstetrics - 10, 1
attics - 6, 1
narcotics - 9, 1
harmonics - 9, 1
ergonomics - 10, 1
anaesthetics - 12, 1
alcoholics - 10, 1
metaphysics - 11, 1
acrylics - 8, 1
kinetics - 8, 1
thermodynamics - 14, 1
aeronautics - 11, 1
cynics - 6, 1
diagnostics - 11, 1
tunics - 6, 1
medics - 6, 1
phonetics - 9, 1
lunatics - 8, 1
analgesics - 10, 1
tonics - 6, 1
picnics - 7, 1
mimics - 6, 1
heretics - 8, 1
acoustics - 9, 1
There are 545 less common words:
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