The name is absent



Alternatively, we can apply Bayesian updating to μt, yielding

μt+ι (E) =


μt(EEt+i)
μ
t (Et+i)


Now we observe that, since EEt+i Ç Et+i Ç Et,

μt (Et+i)

μt(EEt+i)


μ (Et+i)

μ (Et)

μ (EEt+i)
μ (Et)


and hence,

μt+i (E)


μμ(eEt+i)ʌ , μμ‰η

∖   μ (Et)   Γ μ (Et)J

= μt+i (E)

6 Restricted Bayesianism

Given full rationality on a bounded domain, it is natural to consider μlt, the
restriction of the probability measure
μt to events E (p) where p E Nг. That
is,

μt(E (p)) = μt(E (p))

if and only if p E Nt.

We now have two potential ways of deriving μlt+i, given the observation
of
Et+i. We can use the restriction procedure at time t + 1 instead of t,
obtaining μt+i as the restriction of μt+i to Pt. Alternatively, we can apply
Bayesian updating directly to
μt using the information obtained from Et+i.
The first approach yields, for any p E Pt,

μlt+i(E (p)) = μt+i(E (p))

= μ(E (p)e

μt (Et+i)

= μ (E (p) Et+i)

μ (Et+i)

where, as shown in the previous section, the last step works because E (p)
E
t+i Ç Et+i Ç Etso μ (Et+i) = μt (Et+i) μ (Et)



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