## Friday, September 6, 2013

### In the singular interest of accounting for the unit of account in the interest rate

This is an update of this post where I've taken $\kappa = \kappa (NGDP, MB)$ such that

$$\text{(1) } P = \frac{\log NGDP/c_0}{\log MB/c_0}\frac{NGDP}{MB}$$

The fit results in a marginal improvement (in the sense that deviations are more Gaussian) over the original (data is dashed green, light blue is the old fit and dark blue is the new fit):

Interestingly, the modified equation $\text(1)$ seems to do well (well, better than the original calculation) as a price ceiling where:

$$\text{(2) } P \leq \frac{\log NGDP/c_0}{\log MB/c_0}\frac{NGDP}{MB}$$
which is relevant to the case of non-ideal information transfer (data in green, model in gray):

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Also, try to avoid the use of dollar signs as they interfere with my setup of mathjax. I left it set up that way because I think this is funny for an economics blog. You can use € or £ instead.