Use It and Lose It

Oil Drillers' Vanishing Safety Net

Banks are inclined to cut back when energy companies flash signs of weakness.
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A lot of companies view revolving credit lines the way some rock climbers view harnesses and ropes: They would rather not use them, but they're glad to have them when trouble strikes.

So it's worth paying attention when a corporation starts withdrawing a substantial amount of money under these prearranged agreements with banks. This can signal a significant problem.