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question on price demand elasticity

question on price demand elasticity# Economics - 经济

L*w2008-12-31 08:12

1 楼

http://www.mitbbs.com/article_t/TVChinese/31708495.html
师生恋禁断在哪里呢？我认为师生恋之间的禁断就在于双方的人生经验极其不平等，年
长的一方有玩弄少女之嫌，令人唾弃。
花千骨小说里师父白子画是一个上千年的老仙，花千骨刚出场时候只有十二岁。而电视
剧里呢师父是一个活了几百岁的上仙，花千骨刚出场的时候是十六七岁，拜师前又在长
留练了一年剑，上绝情殿的时候也差不多是十八岁一个成年人了。年龄上电视剧里设置
的更合理更能为观众所接受。
你想想看虽然白子画长得年轻，但是他那几百年是白活的吗？人家可还是仙界的精神领
袖啊，那人生经验和生活阅历丰富的是甩花千骨这个小丫头几十条街都不止哇。
就像现代社会里一个四十多岁的英俊大叔看上了一个十五六岁的未成年小萝莉大家会怎
么想，小萝莉的父母会怎么想。我要是小萝莉的父母肯定会想你这个不要脸的老男人勾
引我们家女儿太无耻了。你四十多岁的男人这么丰富的阅历骗一个涉世未深的小姑娘实
在太容易了。对一个在情场摸爬滚打过的老帅哥来说，十六岁的小姑娘想什么你太清楚
了，但是小姑娘对你的心理可是一无所知。这是一场不公平的情场较量。
假如观众们不知道师父是个绝情断欲的千年老处男，单从师父对小骨的种种行为来看，
刚上长留时默许摩严打小骨板子后又巴巴地去探狱送药，相拥着教御剑术，四目相对勾
人心的挂宫铃（这段挂宫铃我看了好多遍，太勾人了），搂抱着教弹琴，默许小骨给他
亲密的梳头，从太白回长留偏不跟大家一块走，单独和小骨坐船上演经典海上看夕阳望
星星桥段再加个耍帅的舞剑，告诉小骨他就是墨冰后紧贴着手把手演示剑法，小骨告诉
他喜欢东方后生怕小骨陷入的不够深还提议师徒二人单独下山历练，这分明是度蜜月的
节奏啊。大家把他的行为前后联系起来想一想，是不是一个妥妥的心机婊？难道师父不
知道自己仙姿绰约对一个少女的杀伤力吗？只要师父身体一靠近，小骨总是一副花痴样
儿，他这无所不知的上仙的眼瞎了吗？说他不知道自己对女人的杀伤力我可不信，紫薰
不就被他迷的不能自拔误了终生吗？
你一个千年道行的上仙爱上了自己十几岁的小徒弟，仙界的明眼人都会知道这全怪白子
画，这就是为什么师父始终不肯承认对小骨有私情，承认了白子画就会被拉下神坛声名
扫地了。

p*y2008-12-31 08:12

2 楼

例如： She is really down to earth.
看到字典说是实际的意思。可是我觉得那样不好解释。

i*u2008-12-31 08:12

3 楼

我想找个类似博客精灵的软件,可以在blogspot和myspace上同时同步贴博.各位可知道
哪里可下这类软件吗?
谢谢.

S*22008-12-31 08:12

4 楼

int add_n ( int n )
{
static int i = 100;
i += n;
return i;
}
调用了几次,结果都是对的...

f*n2008-12-31 08:12

5 楼

Standard textbook on price demand elasticity states that, for one single
commodity, demand d is a function of price p, s.t., d = d(p). If the
objective is to maximize revenue, the optimal price point p* is the point p
such that p*d(p) is maximized.
However, in reality even identical commodities are not sold at one universal
price. For example, TOYOTA CAMRY 2009 may have one MSRP (at least let us
assume so), but different dealers may offer you different discounts so that
the actual out-of-door pr

R*s2008-12-31 08:12

6 楼

名声又不能当饭吃，男未婚女为嫁，想干嘛干嘛...
杨振宁不还拉着翁凡四处蹦跶么？
古代女的大多16，7都嫁人了，20多孩子一大堆了...
反过来说千年女蛇妖和许仙的故事咋就没人仍砖头呢？
还是大家惯性思维把女的放在弱势群体在考虑...

【在 L******w 的大作中提到】

: http://www.mitbbs.com/article_t/TVChinese/31708495.html
: 师生恋禁断在哪里呢？我认为师生恋之间的禁断就在于双方的人生经验极其不平等，年
: 长的一方有玩弄少女之嫌，令人唾弃。
: 花千骨小说里师父白子画是一个上千年的老仙，花千骨刚出场时候只有十二岁。而电视
: 剧里呢师父是一个活了几百岁的上仙，花千骨刚出场的时候是十六七岁，拜师前又在长
: 留练了一年剑，上绝情殿的时候也差不多是十八岁一个成年人了。年龄上电视剧里设置
: 的更合理更能为观众所接受。
: 你想想看虽然白子画长得年轻，但是他那几百年是白活的吗？人家可还是仙界的精神领
: 袖啊，那人生经验和生活阅历丰富的是甩花千骨这个小丫头几十条街都不止哇。
: 就像现代社会里一个四十多岁的英俊大叔看上了一个十五六岁的未成年小萝莉大家会怎

t*e2008-12-31 08:12

7 楼

随和

【在 p*****y 的大作中提到】

: 例如： She is really down to earth.
: 看到字典说是实际的意思。可是我觉得那样不好解释。

a*n2008-12-31 08:12

8 楼

live writer

【在 i*u 的大作中提到】

: 我想找个类似博客精灵的软件,可以在blogspot和myspace上同时同步贴博.各位可知道
: 哪里可下这类软件吗?
: 谢谢.

t*t2008-12-31 08:12

9 楼

不知道你想干嘛, 怎么知道对不对

【在 S*******2 的大作中提到】

: int add_n ( int n )
: {
: static int i = 100;
: i += n;
: return i;
: }
: 调用了几次,结果都是对的...

g*h2008-12-31 08:12

10 楼

If the firm chooses optimal p to maximize p*d(p), it means you are talking
about a firm with some market power, say a monopolist. In that case, the
changing price elasticity of demand (Ed) is revealed in MR curve.
MR = P (1 + 1/ Ed)
Rewrite it, you can get optimal price as a function of Ed:
P = Ed* MC / (Ed + 1)

Y*t2008-12-31 08:12

11 楼

照你这么说，反过来，男的十几岁，女的四十岁，不也一样？！

【在 L******w 的大作中提到】

o*l2008-12-31 08:12

12 楼

土
down to earth = close to earth
接近土地
简称土

【在 p*****y 的大作中提到】

: 例如： She is really down to earth.
: 看到字典说是实际的意思。可是我觉得那样不好解释。

c*t2008-12-31 08:12

13 楼

c*t2008-12-31 08:12

14 楼

will overflow...not safe

【在 S*******2 的大作中提到】

: int add_n ( int n )
: {
: static int i = 100;
: i += n;
: return i;
: }
: 调用了几次,结果都是对的...

f*n2008-12-31 08:12

15 楼

Thanks a lot for the reply. I am a novice in economics, so please bear with
me with my dumb questions.
1. the firm is not a monopolist; the market is competitive; the cost is
fixed and thus ignored. Does it mean that the initial model of p*d(p) does
not apply at all? Should I be looking for something like a perfect
competition model or a peak-load pricing model?
2. My problem with the initial p*d(p) model is, it assumes universal price
for all customers. This is not true in the case we study. Bu

【在 g****h 的大作中提到】

: If the firm chooses optimal p to maximize p*d(p), it means you are talking
: about a firm with some market power, say a monopolist. In that case, the
: changing price elasticity of demand (Ed) is revealed in MR curve.
: MR = P (1 + 1/ Ed)
: Rewrite it, you can get optimal price as a function of Ed:
: P = Ed* MC / (Ed + 1)

p*x2008-12-31 08:12

16 楼

美国人的“土”是说人安分老实。
中国人的“土”是说人土里土气。
好像还不完全一样呢。。。

【在 o********l 的大作中提到】

: 土
: down to earth = close to earth
: 接近土地
: 简称土

i*u2008-12-31 08:12

17 楼

谢谢.

p*o2008-12-31 08:12

18 楼

overflow what?

【在 c**t 的大作中提到】

: will overflow...not safe

g*h2008-12-31 08:12

19 楼

I am not clear about what type of market you want to model.
If it is not monopoly, it still can be monopolistic competitive market. How
many firms in the market? Two, a few, numerous, or one dominant with many
fringe firms?
The seller accepts different prices from customers? You said earlier that
the firm sets price to maximize profit. It is confusing.
You do not do anything. Demand will always drop as you increase price except
for Giffen goods. There are many models of price discrimination. You

t*e2008-12-31 08:12

20 楼

en, i think it's like平易近人，不摆架字，anyway, 褒义词

【在 p*x 的大作中提到】

: 美国人的“土”是说人安分老实。
: 中国人的“土”是说人土里土气。
: 好像还不完全一样呢。。。

M*k2008-12-31 08:12

21 楼

不thread safe?

f*n2008-12-31 08:12

22 楼

Many thank for the clarification.
In terms of monopoly, there are 5 or 6 major suppliers in the market with
some more fringe suppliers. Consumers perceive that there are non-price
differences among the competitors' products; producers have a degree of
control over price.
I think my initial confusion comes from my trying to combine elasticity and
price discrimination in one context. When we say "the firm sets price to
maximize profit", does it mean that you have to assume a single price first?
An

【在 g****h 的大作中提到】

: I am not clear about what type of market you want to model.
: If it is not monopoly, it still can be monopolistic competitive market. How
: many firms in the market? Two, a few, numerous, or one dominant with many
: fringe firms?
: The seller accepts different prices from customers? You said earlier that
: the firm sets price to maximize profit. It is confusing.
: You do not do anything. Demand will always drop as you increase price except
: for Giffen goods. There are many models of price discrimination. You

h*o2008-12-31 08:12

23 楼

from wiki
Down to earth is an English idiom meaning 'practical and realistic': a down-
to-earth person.

h*a2008-12-31 08:12

24 楼

请问 thread safe 和 re-entrant 是否差不多意思？

g*h2008-12-31 08:12

25 楼

When we say "the firm sets price to maximize profit", it does not mean we
have to assume a single price first. The price elasticity of demand is
already known when you have demand curve functions. So firms are actually
maximize profit after knowing its Ed at any price level.
As for the demand curve, firms may face a straight line single demand, a
kinked demand curve, or multiple demand curves for different kinds of
consumers or different scenarios. If you want to study the influence of Ed
on pri

O*e2008-12-31 08:12

26 楼

From the OED:
down, adv.
VII.33. down to earth: back to reality. Also freq. down-to-earth adj. phr.,
interested in everyday affairs; not affectedly superior; realistic;
ordinary.

【在 p*****y 的大作中提到】

: 例如： She is really down to earth.
: 看到字典说是实际的意思。可是我觉得那样不好解释。

X*r2008-12-31 08:12

27 楼

两回事

【在 h****a 的大作中提到】

: 请问 thread safe 和 re-entrant 是否差不多意思？

f*32008-12-31 08:12

28 楼

i guess you 'd better review the hopothesis of demand curve.
When we are talking about market structure, e.g. perfect competitive market,
the demand curve we used was an aggregated one, which contains every single
demand in the market.
However, when we are talking about the price discrimination, actually we
divided the market into some divisions, each of which have it's own demand
curve.
That's why the price gap exists. And whether the market structure is perfect
competitive or not makes little

【在 f**n 的大作中提到】

: Many thank for the clarification.
: In terms of monopoly, there are 5 or 6 major suppliers in the market with
: some more fringe suppliers. Consumers perceive that there are non-price
: differences among the competitors' products; producers have a degree of
: control over price.
: I think my initial confusion comes from my trying to combine elasticity and
: price discrimination in one context. When we say "the firm sets price to
: maximize profit", does it mean that you have to assume a single price first?
: An

f*y2008-12-31 08:12

29 楼

有啥区别呢？

【在 X****r 的大作中提到】

: 两回事

p*g2008-12-31 08:12

30 楼

http://en.wikipedia.org/wiki/Reentrant
The above even mention the difference between them.

f*y2008-12-31 08:12

31 楼

谁能给个例子看看
thread safe but 不可重入

【在 p**********g 的大作中提到】

: http://en.wikipedia.org/wiki/Reentrant
: The above even mention the difference between them.

t*t2008-12-31 08:12

32 楼

a function may use some global data. if you want it to be thread safe, just
put lock around the access. however, putting lock around the access can't
make it reentrant: image an interrupt happen when then lock is on. the
function is called again, then it can not get lock thus it is deadlocked.

【在 f*******y 的大作中提到】

: 谁能给个例子看看
: thread safe but 不可重入

p*g2008-12-31 08:12

33 楼

多些讨论
在isr里，如果调用printf会有什么问题？假设printf是可以call的