Introducing the Observer 100 Index

This year will bring either a dazzlingly financial apocalypse (the analyst Howard Davidowitz has said we’re on “a death march”), a revival that catapults New York into a new era of giddy splendor, or an uneven and slow sludge back to normalcy. Manhattan will expire, sparkle, or crawl.

One comparatively easy way to take the city’s temperature as its health gets sorted out is to follow the stocks that define it. We assembled the Observer…