18. Assuming, in a two-period model, that the nominal wage rate increases from $10/hour to
$15/hour； the expected price level increases from I to 3； and the actual price level increases from
4 to 5, we can deduce that
(A) nominal wage rate decreases.
(B) expected real wage rate increases.
(C) actual real wage rate increases.
(D) All of the above are correct.
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