Data Description
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* The monthly time series data on 15 monetary asset quantities, ci in billions of dollars, and their user costs, pi, are taken from the Center for Financial Stability program, Advances in Monetary and Financial Measurement (AMFM). 
* For a detailed discussion of the data and the methodology for the calculation of user costs, see Barnett et al. (2013) and http://www.centerfornancialstability.org.http://www.centerfornancialstability.org . 
* The mnemonics and order of the monetary assets are listed in Table 1 of the text.
* Population (in thousands) data were downloaded from FRED, https://fred.stlouisfed.org/series/POPTHM
* CPI is Consumer Price Index for All Urban Consumers, downloaded from FRED, https://fred.stlouisfed.org/series/CPIAUCSL 

We calculated real per capita series for each monetary asset, as follows:

1000000000*ci/(population*1000*CPI)