PII: 0304-4076(85)90134-4deaton/downloads/Panel_Data... · = a, + "log it + (3) dropped, and...
18
PII: 0304-4076(85)90134-4deaton/downloads/Panel_Data... · = a, + "log it + (3) dropped, and systems of Engel curves are estimated. In the second, the equation is aggregated over