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STOCHASTIC

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SUBJECTIVE PROBABILITIES ANT EXPECTED UTILITIES 1421<br />

Event A is null if and only if P ~ Q whenever P, Q in 3C agree on A°.<br />

With these definitions at hand we shall turn to a set of axioms that implies<br />

the existence of a real function uonX and a probability measure P* on (the set<br />

of all subsets of) S such that, for all P, QE3C,<br />

(2) P < Q if and only if E[E(u, P(s)), P*] g E\E(u, 0(g)), P*].<br />

Expression (1) results from (2) on defining/ =» g if and only if P < Q when<br />

^(*)(/(*)) = (>(*)(»(*)) = 1 for all s£S. When P(s)(/(s)) = lforallseS,<br />

B[fi(u, ?(•)), P*]-^[u(f(»)), P*J-<br />

3. Axioms and summary theorem. In addition to the structural assumptions<br />

of the preceding section ((P is the set of simple probability measures on JC, 3C<br />

is the set of all functions on S to

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