Fabrizio Cariani

speaker

176 appearances 1 recordings 1 series first heard Jul 2010 last heard Jul 2010

Fabrizio Cariani’s voice in public audio — every appearance, attributed to the second.

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Elucidations · Episode 13: Fabrizio Cariani discusses judgment aggregation · 9 Jul 2010 podcast

First of all, there actually are cases like this.

So when Germany got

Unified at the beginning of the 1990s.

I mean, this is a little bit, it's not completely true what I'm about to tell you, but it's fairly close to true.

That there was a referendum that was taken as to whether or not Berlin or Bonn should be the new capital.

And from the administrative point of view, the vote was: should the parliament move from Berlin to Bonn?

Should the government move from Berlin to Bonn?

And should the parliament and the government

government being the same city.

Now those three propositions are logically connected in such a way that you could conceive a distribution of opinions in which you could actually get inconsistent results.

For example, there could be a majority for the proposition that the parliament should move to Berlin, a majority for the proposition that the government should stay in Bonn,

And also a majority for the proposition that the parliament and the government should be in the same city.

And when that happens, of course you have some kind of inconsistent collective belief.

So in one sense, yes, there are some problems with majority principles for aggregating beliefs.

On the other hand, when there are no logical connections between propositions, majority principles serve us very well.

Because it seems, you know, if we are deciding on an individual proposition, for example, majority is very good because the identities of the particular believers don't matter, for example.

Uh for example, we could have a committee that was formed on me

You and Matt, right.

But the committee could be such that math gets to make all the decision, right?

That would be one way of aggregating our opinions, but it would not be a particularly fair way.

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