1. The Historical Context of Absorption Costing
Traditional plant-wide and departmental overhead allocation systems were designed in the early 20th century. At that time, manufacturing processes were labor-intensive, product ranges were narrow, and indirect overheads made up a tiny fraction of total costs. Direct labor hours or machine hours were reliable surrogates for measuring overhead consumption.
2. The Modern Manufacturing Landscape Shift
Automation, advanced robotics, and enterprise software have flipped cost structures upside down. Direct labor has shrunk to a single-digit percentage of total product cost, while indirect factory overheads (such as setup engineering, scheduling, and quality assurance software) have spiked.
   PAST COST STRUCTURES vs. MODERN COST STRUCTURES
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  Past:   [ DIRECT MATERIALS: 50% ] [ DIRECT LABOR: 40% ] [ OVERHEADS: 10% ]
  Modern: [ DIRECT MATERIALS: 50% ] [ DIRECT LABOR: 5%  ] [ OVERHEADS: 45% ]
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3. Product Cost Distortion and Product-Line Cross-Subsidization
Using a single volume-based metric (like machine hours) to spread modern overheads creates severe distortions:
  • High-Volume Products: Often simple, standardized items that require minimal management attention. Because they consume many machine hours, they are assigned an unfairly large share of factory overheads.
  • Low-Volume Products: Often complex, highly customized items that require constant engineering setups, inspections, and schedule changes. Because they run quickly on machines, they are assigned a tiny share of overheads.
  • Result: The high-volume product line cross-subsidizes the low-volume product line. This masks the true cost of customization and can lead management to underprice complex products and overprice standard ones.

 
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