Text stimulus (map): Schematic regional map titled 'Housing, Transit, and Employment.' On the east side, show three clusters labeled 'Lower-Cost Housing' with 600 total units. On the west side, show two large employment centers labeled '12,000 jobs' and '8,000 jobs.' One bus route between east and west labeled 'Every 60 minutes' and a frequent rail line serving only the west side. Additional evidence: a scale bar showing 12 miles from housing clusters to job centers. Which concept best describes the pattern?