What was the greatest cost-cutting measurement you accomplished at your previous employer?

"I have been able to present cost-cutting suggestions many times to my previous employer. The one that I feel had the biggest impact was when I suggested additional warehouse staff. We had three various shifts and still an average of 100 hours of overtime per week. I presented to my employer that we hire one more warehouse employee for each shift, keeping the hours to just 120 regular vs. 100 hours of overtime pay (@1.5x) This recommendation saved the company 31,000 per year. They implemented this change across 15 warehouses the following year, amounting to nearly half a million dollars in savings per year."