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【单选题】
If the aggregate price level at time t is denoted by Pt, the inflation rate from time t - 1 to t is defined asA.
πt = (Pt - Pt - 1)/Pt - 1.
B.
πt = (Pt + 1 - Pt - 1)/Pt - 1.
C.
πt = (Pt + 1 - Pt )/Pt.
D.
πt = (Pt - Pt - 1)/Pt.
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