In the setting of Exercise 8.1, let P denote the physical probability and assume E Pt+1

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In the setting of Exercise 8.1, let P denote the physical probability and assume E



Pt+1 +Dt+1 Pt



= Rf .

Suppose there is an infinite horizon. Show that there is no probability Q on the space of infinite paths that is

(a) equivalent to P, and

(b) satisfies E∗

t



Pt+1 + Dt+1 Pt



= Rf for each t, whereE∗ denotes expectation with respecttoQ. Hint: Applythe strong law of large numbers to show that any Q satisfying

(b) cannot be equivalent to P.

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