Pure exchange system An allocation A=(x, x))is feasible if , for any I=l,…L @, is the endowments of commodity l Edgeworth box:2×2Pure exchange system • An allocation A= (x1 ,…xI ) is feasible if • is the endowments of commodity l • Edgeworth box: 2×2 1 , for any 1, I li l i x l L  =   = l