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The CEOs of the world's biggest companies lost confidence in the economy this month as the Iran war dragged on, a new survey finds.

Why it matters: Business leaders who lack confidence tend to pull back on hiring and investment, weighing further on the economy.

Zoom in: CEO confidence fell 12 points in the second quarter of the year to 47, per the survey from The Conference Board, a nonpartisan think tank, and The Business Council, an association of CEOs.