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The Contents section at the beginning of the rules says "1 Integrated Economy Tile". (p2)
This would imply that one tile is only in play in a 6-player game in the starting package.
The New Game Tiles section (p6), Super Industry Tiles (plural) subheading says "these new tiles" (plural) "are purchased and placed in the Develop phase", suggesting there are many of them.
How many are there? (trying to add the second gen. rules to my first gen. copy)
Just one tile with War Clouds, but there were 3 additional Super Industry tiles in a separate min-expansion:
This thread might help explain: