One condition for the first welfare theorem to hold is that there are no externalities.Can this condition be re-phrased as "all property rights have been established"? And how does this justify a wide range of what we see government doing?

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The Answer of One condition for the first welfare theorem to hold is that there are no externalities.Can this condition be re-phrased as "all property rights have been established"? And how does this justify a wide range of what we see government doing?

One Condition for the First Welfare Theorem to Hold Is