Advancements in production and distribution methods came to focus on cost-containment, inventory control and asset management.
Such attitudes as "a good product will sell itself" or "we can sell whatever we make" receded.
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One could count EVERY item (if the group were small enough), or base a count on statistics (assuming randomness) and count, say, every one item in ten. I am not a professional statistician, nor have...
Inventory Management. Use scientific methods for inventory optimisation. Many software systems available on the market. Hundreds on textbooks.