The best replacement for increasing is decreasing function.

The best alternatives to increasing are rated as following:
★★★★★  decreasing function
★★★★  decreasing functions
★★★★  decreasing sequence
★★  increased
★★  strictly increasing
★  decreasing
★  ever-increasing

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Speaking about increasing, one probably shouldn't forget about increasing.

Other search terms related to increasing and their ratings are:
★★★★★ increasing
★★ revenue increase
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increasing
decreasing function
decreasing functions