Psychological Aspects of Market Crashes



where for every history st the real number μ > 0 is the Lagrange multiplier
associated with the Constraint (2). Taking the first-order conditions with
respect to every variable yields the following relationships for every history
st-1 and asset j

dPit-1 βt 1 ui(cit-1 )  =  μst-1 and                      (7)

∑ μit [djit + qjt]  =  μit-1 qjt- 1 >                     (8)

st,st-1

Rearranging terms gives

X  dPsit βtiu0i(cst) [djst + qsjt] = dPsit-1 βit-1 u0i(cst-1) qsjt-1,     (9)

st,st-1

and by (5) and some simplifications we obtain the desired relationship

X Psit βi u0i(cst) Rsjt = u0i(cst-1).                    (10)

st,st-1

With the above relationship, we can prove our result. Fix ε > 0 and a
history
st. It is easy to see that, for every δ > 0 such that Pi > δ for every
i, there exists an agent, denoted by δ(i), such that for the history st-1 such
that
st st-1 we have that cδ(-)1 w 1 in equilibrium.

Since ui satisfies the Inada conditions for every i, this last remark implies
that the expression
u0δ(i)(cδ(--)1 ) is bounded away from + for every δ > 0.

Also, since ci(i) wst and by the Inada conditions, a low enough value of
aggregate endowment
wst in history st will increase the left-hand side of (10)
above to an arbitrary high level. Thus, as
δ converges to 1 and wsst converges
to 0, for (10) to hold for agent
δ(i) it must be true that Rsjst converges to
0 for every
j such that djsst > 0. Thus, it is straightforward to find the two

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