TY  - BOOK
AU  - .
ED  - National Bureau of Economic Research.
TI  - None
T2  - NBER working paper series
PY  - 1976///
CY  - Cambridge, Mass.
PB  - National Bureau of Economic Research
N1  - November 1976; Hardcopy version available to institutional subscribers
N2  - This paper number accidentally skipped in the early days of working paper publishing.  No paper ever existed for this number
UR  - https://www.nber.org/papers/w0156
UR  - http://dx.doi.org/10.3386/w0156
ER  -