for this ques i had to back to dfs and there i found that when there were exogeneous supply shocks or price level they were using the term up and down and otherwise left and right .
43 > y= ak bar + bl
l s = -y + Dw/p
perfect competition condition implies taht there ll be mpl = w/p
so mpl = dy/dl = b = w/p = Lab ss = -y + d w/p solving yields a
44>nominal wage is rigid so for high values of p : w/p decreases --> so lab dd wud increase to balanc eqn b = w/p --> tthere is perfect foresight so lab. ss shifts left and o/p won't increase so its vertical .
for mid-range values : p and y have negative relation : as p increase real wages decrease and lab dd increase while lab ss shifts left
for low values of p :they ll produce a certain o/p
45 >indeed taht wud boost prodn and shifts to d right
46 > its kind of exog sss shock because costs hav gone up so a .
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