Within the IS – LM model, what would be the effect of an autonomous increase in saving that was matched by a drop in consumption—that is, a fall in a in the consumption function? C = a + b(Y – T)...

Within the IS – LM model, what would be the effect of an autonomous increase in saving that was matched by a drop in consumption—that is, a fall in a in the consumption function?

C = a + b(Y – T)

Which schedule would shift? How would income and the interest rate be affected?