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][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.

[/quote]

The trades don't have to happen as trades per se. If there is one kid at each school who is also on the waitlist at the other school, if a spot opens up at either school both kids move -- when one moves he opens a spot for the other, who then moves -- and opens a spot for someone else. If there are lots of kids on the waitlist it still only takes one spot at one school for a whole lot of kids to move.  This is what used to happen in the bad old days. Spots always open up, there were tens of thousands of kids on waitlists, one move means lots of kids move.

My old elementary school didn't even start taking attendance until into September.[/quote]

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