Question
In the proof of Arrow's theorem, what does it mean to say that a group of people $\mathrm{D}$ is decisive with respect to the social states $(a, b)$ ?
Step 1
In other words, if every member of $\mathrm{D}$ prefers state $a$ over state $b$, then the social preference will also rank $a$ above $b$. Show more…
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