# Getting Access to Spreadsheet Models for Managers

If you use Excel to model businesses, business processes, or business transactions, this course will change your life. You’ll learn how to create tools for yourself that will amaze even you. Unrestricted use of this material is available in two ways.

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It resides on your computer, and you can use it anywhere. No need for Internet access.
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 Order "Spreadsheet Models for Managers, on-line edition, one month" by credit card, for USD 69.95 each, using our secure server, and receive download instructions by return email.
 Order "Spreadsheet Models for Managers, on-line edition, three months" by credit card, for USD 199.00 each, using our secure server, and receive download instructions by return email.
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## Spreadsheet Models for Managers

 Economic order quantity
• EOQ: Lowest-cost order quantity for constant demand

It can be shown mathematically that EOQ is the value of Q for which
Ordering Costs = Carrying Costs.

Last Modified: Wednesday, 27-Apr-2016 04:15:26 EDT

Assuming Constant Demand

Although the assumption of constant demand is critical to justifying the derivation of the formula for Economic Order Quantity, most problems don’t satisfy that requirement in the strict sense. But EOQ is nevertheless a valuable concept in two kinds of circumstances. The first case is when the time scale of the inventory management decisions is much shorter than the time scale of the variations in demand. And the second is when the fluctuations in demand occur much more rapidly than the inventory management decisions.

These two approximations occur repeatedly in modeling problems. Watch for opportunities to apply them elsewhere.