- What's New: Suburbs in a New Light Suburbs' New Anatomy: What 25 Regions Show--Neal Peirce Tax sharing debated in Sacramento, CA Sprawl on Fast Track in Cincinnati MARC's Research: The Pattern of Social Separation and Sprawl The Metropolitan Area Research Corporation (MARC) is a non-profit research and geographic information systems (GIS) firm with a history of service to the public interest, ...www.metroresearch.org