Walras's law
= Walras's law
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{title2=$p\cdot z(p)=0$}
{wiki}
= Walras law
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{synonym}
At any price vector, the total value of aggregate excess demand is zero when consumers exhaust their budgets. After normalization to a price <simplex>, choosing a price that maximizes the value of a candidate excess-demand vector is a useful <Kakutani fixed-point theorem> construction.