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7474742 发表于 2010-2-20 18:25

乱七八糟,,,,,,,,,,,,,,,,,,,,,,,,,,

fanluping 发表于 2010-2-20 18:28

回复 1# kira1122


    谢谢》》》》》》》》》

princess_ann5 发表于 2010-2-20 18:35

好像挺多阿 ,也不知道都是什么.....

lwcn 发表于 2010-2-20 19:55

我来赚点经验亚麻或黑。。需要体力点。。

kongswim 发表于 2010-2-20 20:00

:hug::hug::victory::victory::handshake

kongkongdaoren 发表于 2010-2-20 20:20

xiwangyoubangzhu.........................................

kangboli123 发表于 2010-2-20 20:31

回复 13# angela126


    tai nan le

kangboli123 发表于 2010-2-20 20:32

:LWe consider a model of socially interacting individuals that make a binary choice in a
context of positive additive endogenous externalities. It encompasses as particular cases
several models from the sociology and economics literature. We extend previous results
to the case of a general distribution of idiosyncratic preferences, called here Idiosyncratic
Willingnesses to Pay (IWP).
Positive additive externalities yield a family of inverse demand curves that include the
classical downward sloping ones but also new ones with non constant convexity. When j,
the ratio of the social in
uence strength to the standard deviation of the IWP distribution,
is small enough, the inverse demand is a classical monotonic (decreasing) function of the
adoption rate. Even if the IWP distribution is mono-modal, there is a critical value of j
above which the inverse demand is non monotonic, decreasing for small and high adoption
rates, but increasing within some intermediate range. Depending on the price there are
thus either one or two equilibria.
Beyond this rst result, we exhibit the generic properties of the boundaries limiting
the regions where the system presents dierent types of equilibria (unique or multiple).
These properties are shown to depend only on qualitative features of the IWP distribution:
modality (number of maxima), smoothness and type of support (compact or innite). The
main results are summarized as phase diagrams in the space of the model parameters, on
which the regions of multiple equilibria are precisely delimited.
1
halshs-00135405, version 1 - 7 Mar 2007

lusyever 发表于 2010-2-20 20:33

a~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

wujianqiubai 发表于 2010-2-20 20:45

:'( ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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