Steel Dynamics, Inc. STLD

Using a log-log framework, revenue appears driven by SG&A spending with an elasticity of 1.15, meaning a 1% rise in SG&A is associated with about a 1.15% lift in revenue, so SG&A investments act as a lever for topline growth. The model achieves a 7.5% MAPE but exhibits holdout overprediction (predicted $4.9B vs actual $4.4B, -11.7%), signaling positive revenue leverage from spending with some forecast uncertainty. The implied ROI of SG&A spending is positive in terms of revenue contribution, but profitability depends on margins that the data provided do not reveal. The FY outlook shows revenue near $22B, up about 20.6% year over year, indicating strong growth momentum while prompting close monitoring of cost efficiency to translate top-line gains into earnings.