In a pure exchange economy with differential information and a finite set of traders, physical commodities and states of nature, we characterize the Walrasian expectations or Radner equilibria by using the veto power of the grand coalition. We prove that an allocation x is a Radner equilibrium allocation if and only if it is "privately non-dominated" by the grand coalition in every economy obtained by perturbing the original initial endowments in the direction of x. The first and second welfare theorems become particular cases of our main result. Since the deterministic Arrow-DebreuMcKenzie model is a special case of the differential information economy model we also provide a new characterization of the Walrasian equilibria.

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We consider a continuum economy with infinitely many commodities and show that, for any positive =, the core of the economy coincides with the set of allocations which are not blocked by any coalition with measure less than =. Actually, our main result is an extension of Grodal's (1972, Econometrica 40, 581 583) result and, therefore, Schmeidler's (1972, Econometrica 40, 579 580) result to economies whose commodity space is l , for myopic preferences. Journal of Economic Literature Classification Numbers: C71, D51.