Almost all firms share certain value chain activities. For example, most firms have a centralized finance and accounting department, a procurement, an MIS and an HR function. Given this fact, two...

Almost all firms share certain value chain activities. For example, most firms have a centralized finance and accounting department, a procurement, an MIS and an HR function. Given this fact, two firms from unrelated industries are planning to merge simply to combine their overhead functions, which constitute a large fraction (e.g., > 40%) of their individual cost basis. Is the logic sound? Why or why not?