... identify the systemin our application are self-identification as the primarymeal preparer, self-identification as the primary groceryshopper, whether the diary day was a weekend, whether the ... in one of these occupational cate-gories. Only a handful of female respondents reportworking in these fields and thus we exclude this dummy from the female regressions. We sum only spells of ... whether the diary day was in the summer, whether the diary daycame from 2007, the grocery price index, th e hourlyopportunity cost of time, and the household’ sannualnonwage income. The instrumental...