?A process {yt} is a martingale if _____ is equal toytfor allt? 0.
A. ?E(yt+1|yt, yt-1, …, y0)
B. ?E(yt+1|yt-1, …,y0)
C. ?E(yt+1, yt| yt-1, …, y0)
D. ?E(yt+1, yt| yt-1, yt-2)
Answer: A
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