Food sections of core stores offer a modest coverage of dried, frozen, preserved items. You could, if you wished, subsist on these for a tiny sum—and I have met a few artists and other oddball types who claim they do, being unwilling to spend their time earning the income needed for better fare. Many Ecotopians, however, seem to buy only bread, beans, rice, fruit and similar staples from these stores, relying on small independent shops for meat, produce, etc.—or shipments from fellow communes. (Lumber camp gets its meat, milk and vegetables from a farm commune 15 miles away.)
