why aggregate demand curve is upward sloping (i.e., it originates from the y axis) ?

Hey Aishwaraya,

Answers provided by Sparsh and Sarabjeet are correct.

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AD curve originates form y axis because even at 0 income demand cannot be zero. There is always demand (by borrowing or any other means).
Ad is upward sloping because with increase in income there is always increase in demand (may be with lesser proportion)
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AD curve originates form y axis because even at 0 income demand cannot be zero. There isalways some consumption to be made to be alive also known as autonomous consumption.. The Ad curve is an upward sloping curve as its but natural for any consumer to raise his standards of living with the rise in income. Therefore the AD curve is linear positively sloped line.
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