It’s been frustrating to me that so much virtual ink has been spilled about why the fiscal package will or will not be effective, with so little clarity. Lots and lots of words are being thrown around, [1] [2] when a lot of the arguments can be summarized pretty easily in terms of four cases, and hence four graphs (I won’t deal with the fifth, in detail). There are numerous excellent critiques; here in the interest of specificity, the exposition will be fairly dense.
1. With prices predetermined, the interest sensitivity of money demand is zero, or the income sensitivity of money demand is infinite.
2. With prices predetermined, the interest sensitivity of investment or the sensitivity of net exports to interest rates are infinite.
3. With prices predetermined, the sensitivity of money demand to wealth is high.
4. Output is at full employment levels.
5. Neo-Ricardian equivalence, as put forward by Barro, holds.
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