Reply to Fairness of Common Lottery?

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Reply to "Fairness of Common Lottery?"

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[quote=Anonymous][quote=Anonymous][quote=Anonymous]

The WL shuffle was something different -- b/c all the charters ran their own lotteries, people would get accepted at multiple schools; once they accepted one and declined the others, that opened up spaces for people on the WL. Whether the common lottery algorithm weights lottery number or ranking preference more heavily, as long as almost all the charters are participating in the common lottery, we won't go back to the churn of the old days.[/quote]

In a system where ranking preference is waited more heavily, mutually beneficial trades are possible. That's essentially what wait-list shuffle is, working out all the mutually beneficial trades.[/quote]

But practically speaking, those trades can't actually occur, even if they would be mutually beneficial -- two families can't just meet and agree to swap, both families would have to be at/near the top of the other school's waitlist, and one family would have to turn down an actual spot in favor of the spot they assume would materialize after the other family moved off the waitlist into their spot.

So even if mutually beneficially trades are theoretically possible, there won't actually be any trading/churn.

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