Bargaining Power and Equilibrium Consumption



a specific sociological group, with added emphasis on inter-household or spill-over ef-
fects. We distinguish between “first members” and “second members” of households.
With particular consumer characteristics, spill-overs are absent: The effects of a change
of bargaining power within a household are confined to that household. With differ-
ent consumer characteristics, spill-overs can occur exactly as described earlier. For
instance, a first member of a household benefits from an increase in own bargaining
power, but loses if
ceteris paribus first members of other households gain more bargain-
ing power. In Section 6, we offer concluding remarks.

2 General Equilibrium Model

We consider a finite pure exchange economy. The main departure from the traditional
model is that a household can have several members, each with their own preferences.

Fixed Household Structure.

The population is divided into finitely many households h = 1, . . . , n, with n ≥ 2.
Each household
h consists of finitely many members i = hm with m = 1, . . . , m(h),
m(h) 1. Put I = {hm : h = 1, . . . , n; m = 1, . . . , m(h)}, the finite population of
individuals to be considered.

Commodities, Endowments, and Individual Preferences.

The commodity space is IR' with ' ≥ 1. Household h is endowed with a commodity
bundle
ωh IR', ωh > 0. The aggregate or social endowment is ω = hωh ωh. A generic
individual
i = hm I has:

consumption set Xi = IR+;

preferences £ i on the allocation space X ≡ ∏jj Xj represented by a utility
function
Ui : X -→ IR.

The consumption bundle of a generic individual i is denoted by xi. Let x = (xi), y =
(
yi) denote generic elements of X. For h = 1, . . . , n, define Xh = Qmm(=h1) Xhm with
generic elements
xh = (xh1, . . . , xhm(h)). If x X is an allocation, then for h = 1, . . . , n,
household consumption is given by
xh = (xh1 , . . . , xhm(h) ) Xh.



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