※ 引述《wildfly (工作很難找捏!)》之銘言:
: 某研究所97年考題
: 題目如下
: Consider the exponential utility function -exp(-ρc).Show that it is
: increasing (u'>0) and concave (u"<0) for all c>0 as long as ρ>0,that is,
: as long as that agent is risk-averse.Show that this function has constant
: absolute risk aversion coefficient γA given by ρ.
: 這題我看了好久
: 在想是不是要求風險値
: 無奈一直不知道從何下筆
: 而這題後面還有延伸其他小題
u' = ρexp(-ρc)
u" = -ρ^2exp(-ρc)
所以當 ρ>0 時, u'>0 and u"<0.
Absolute risk aversion coefficient = -u"/u' = ρ,
which is a constant given by ρ.
: 1-ρ
: C
: 2) ------- ,ρ≠1 3) ln(c)
: 1-ρ
: 懇請版上的高手能提點一下
: 感謝。
一樣
--
: 某研究所97年考題
: 題目如下
: Consider the exponential utility function -exp(-ρc).Show that it is
: increasing (u'>0) and concave (u"<0) for all c>0 as long as ρ>0,that is,
: as long as that agent is risk-averse.Show that this function has constant
: absolute risk aversion coefficient γA given by ρ.
: 這題我看了好久
: 在想是不是要求風險値
: 無奈一直不知道從何下筆
: 而這題後面還有延伸其他小題
u' = ρexp(-ρc)
u" = -ρ^2exp(-ρc)
所以當 ρ>0 時, u'>0 and u"<0.
Absolute risk aversion coefficient = -u"/u' = ρ,
which is a constant given by ρ.
: 1-ρ
: C
: 2) ------- ,ρ≠1 3) ln(c)
: 1-ρ
: 懇請版上的高手能提點一下
: 感謝。
一樣
--
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