SLIDE 8 11/19/2019 8
Keynesians – Long Run
P LAS0 SAS0 AD0 Y Ypot P0 AD1
In LR: Y returns to Ypot and the multiplier = 0. But, both the deficit and debt increase because the government borrows to finance the tax cut.
A B SAS1 C P3 P2
Supply Siders say lower tax rates (t) shift AD right AND also shift LAS and SAS to the right
P LAS0 SAS0 AD0 Y Ypot P0 AD1 In LR, Ypot increases to Ypot1. P does not rise as much (P4 compared to P3) and the multiplier in the long-run > 0, Ypot / T >0. Also, tax revenues increase as Y increases: T = (t x Y) as potential GDP
- increases. The deficit does not increase as much.
SAS2 LAS1 A B D P2 C P3 Ypot1 P4 SAS1
Big Question – How large is the supply- side effect on AS?
P LAS0 SAS0 AD0 Y Ypot P0 AD1 LAS1 A B P2 C P3 Ypot1
If small, closer to point C in the long-run – the Keynesian result. If large, closer to point B.