The season's order
An order changes as demand, packing, cost and delivery become known.
This is a fictional case. The season runs for 84 days from 1 June 2026. Demand is uniform within each illustrated outcome. There is no replenishment beyond the shipment you choose. A sale that stock cannot serve is lost, and stock left at the close returns its salvage value. CU is a fictional currency unit. Every price, rate, date and clock rule here is an assumption of this case.
1. Last season's sales book
· Planning desk
The sales book records how many units sold last season and the day the stock ran out. The season is 84 days long. Stock was available every day before that sellout, so every buyer who came was served. Nothing in the book records the sales that could not happen once the stock was gone.
Available facts
- Information date
- Season length84 days
- First day of the season
Inputs and givens
Case range: 1,000 to 10,000 units.
Case range: 1 to 84 days.
If the observed daily demand had continued, how many units would the full season have required?
Units. Within 10 units
Within 10 units From 0 to 20,000.
The score is a target for this attempt. It is not a judgement of you.
Typing the model's own answer earns full marks.
A number within the stated tolerance earns 10 points. Beyond it, each further tolerance removes 1 point, down to 0.
Numerical findings appear after checking.
How this check is calculated
Divide the units sold by the day the stock ran out to get a daily rate, then multiply that rate by the season length. The result is what the season would have required at that rate.
Show the full maths
Symbols and assumptions
s is the units sold, t is the sellout day and H is the season length. The estimate is s divided by t, multiplied by H. The illustrative demand table then shifts by the rounded difference between that estimate and the fixed anchor the table was drawn around. Every quantity moves by the same whole number and the probabilities stay fixed. That shift is a transparent transformation of an illustrative table. It is not a fitted forecast, and its mean need not equal the extrapolation.
Every quantity, price, rate and clock rule in this case is fictional. The book named below explains mechanisms and supplied none of these numbers.
Read the underlying mechanisms
Check this step before continuing.
The season's order
An order changes as demand, packing, cost and delivery become known.
This is a fictional case. The season runs for 84 days from 1 June 2026. Demand is uniform within each illustrated outcome. There is no replenishment beyond the shipment you choose. A sale that stock cannot serve is lost, and stock left at the close returns its salvage value. CU is a fictional currency unit. Every price, rate, date and clock rule here is an assumption of this case.
Journey incomplete
1. Last season's sales book
· Planning desk
The sales book records how many units sold last season and the day the stock ran out. The season is 84 days long. Stock was available every day before that sellout, so every buyer who came was served. Nothing in the book records the sales that could not happen once the stock was gone.
- Information date
- Season length84 days
- First day of the season
Not checked in this attempt
- Units sold before last season ran out4200
- Day of last season's sellout70
How this check is calculated
Divide the units sold by the day the stock ran out to get a daily rate, then multiply that rate by the season length. The result is what the season would have required at that rate.
Show the full maths
Symbols and assumptions
s is the units sold, t is the sellout day and H is the season length. The estimate is s divided by t, multiplied by H. The illustrative demand table then shifts by the rounded difference between that estimate and the fixed anchor the table was drawn around. Every quantity moves by the same whole number and the probabilities stay fixed. That shift is a transparent transformation of an illustrative table. It is not a fitted forecast, and its mean need not equal the extrapolation.
Every quantity, price, rate and clock rule in this case is fictional. The book named below explains mechanisms and supplied none of these numbers.
Read the underlying mechanisms
2. The provisional order
Not reached in this attempt
3. The container boundary
Not reached in this attempt
4. The detailed cost sheet
Not reached in this attempt
5. One vessel, several transfers
Not reached in this attempt
6. The origin stock call
Not reached in this attempt
7. The two clocks
Not reached in this attempt
Your order decision record
Journey incomplete
Only checked steps appear in this account. Later events and unchecked answers are left out.
Dated decisions
0 from 0 checked steps
Final possible total: 70 points
Checks in this attempt
| Step | Your answer | Model target | Points | Tolerance |
|---|
The score is a target for this attempt. It is not a judgement of you. Typing the model's own answer earns full marks.
A number within the stated tolerance earns 10 points. Beyond it, each further tolerance removes 1 point, down to 0.
Sources
One book supplies context for the inventory mechanisms. Every quantity, price, date and clock rule in this case is fictional and belongs to the case alone.
- Gérard P. Cachon and Christian Terwiesch, Matching Supply with Demand: An Introduction to Operations Management, 4th edition, McGraw Hill Education, 2018.
Demand under uncertainty, ordering with leftovers and shortages, and inventory over a selling season.