TY  - JOUR
TI  - An Illustration of a Pitfall in Estimating the Effects of Aggregate Variables on Micro Units
AU  - Brent R. Moulton
JO  - The Review of Economics and Statistics
PY  - 1990
VL  - 72
IS  - 2
DO  - 10.2307/2109724
UR  - https://doi.org/10.2307/2109724
ER  -