Tensions in Practice: Three suppliers can hide one large dependency¶
The same three suppliers, different order weights
Imagine buying 10 interchangeable units from the same three suppliers. Any order of at least 8 units receives a stipulated price of 1 per unit; smaller orders cost 2 per unit. Compare orders of 8/1/1 with 4/3/3. In each failure scenario exactly the named supplier provides nothing and the others fulfill their orders. There is no replacement supply in the period. The provider count stays three while the largest single-provider loss changes.
Capture a volume discount
Concentrate enough of the order to qualify for the stated lower price.
Limit one-provider exposure
Spread the order so no one supplier accounts for most of the required units.
Why these aims pull against each other
Changing the weight distribution changes both the stipulated purchase cost and the amount tied to each supplier. Counting supplier names captures neither.
Choose an arrangement to see what changes and what remains difficult.
Compare the same rows across alternatives. Cells state explicit toy quantities, membership or permissions; colors do not supply additional meaning.
What this choice protects
What it costs
When it fits
Compare the arrangements
Order 8 / 1 / 1
Supplier A receives 8 units at price 1; B and C each receive 1 at price 2. Total cost is 12 and the largest modeled loss is 8.
| Supply units | Order cost | Loss if absent | |
|---|---|---|---|
| A | 8 | 8 | 8 |
| B | 1 | 2 | 1 |
| C | 1 | 2 | 1 |
- What it protects
- The toy volume discount lowers total purchase cost to 12.
- What it costs
- A’s absence removes 8 of the 10 required units despite having three named suppliers.
- When it fits
- Plausible if the lower cost is worth the explicitly accepted concentration exposure and other protections cover the consequences.
Illustration note: This is an editorial, deliberately bounded illustration. Its stated rules and any numbers are invented, not observations, recommended settings, or predictions.
Order 4 / 3 / 3
No supplier reaches the discount threshold. At price 2 per unit, total cost is 20; the largest modeled loss is 4.
| Supply units | Order cost | Loss if absent | |
|---|---|---|---|
| A | 4 | 8 | 4 |
| B | 3 | 6 | 3 |
| C | 3 | 6 | 3 |
- What it protects
- No single named supplier’s absence removes more than 4 units in these scenarios.
- What it costs
- The same total supply costs 20 instead of 12; exposure to multiple failures remains.
- When it fits
- Plausible when limiting the maximum single-provider shortfall warrants the higher cost.
Illustration note: This is an editorial, deliberately bounded illustration. Its stated rules and any numbers are invented, not observations, recommended settings, or predictions.
What this illustration does—and does not—establish
The source establishes the structural tension; the concrete alternatives and their conditional costs are editorial synthesis. No arrangement is a universal recommendation.
- The discount and failure scenarios are invented. No probability, expected loss or reliability ranking is supplied.
- Hidden common upstream dependencies could invalidate the assumed one-supplier scenario. Separate names do not establish independence.
- The diversified order limits a particular shortfall; it does not guarantee that the system can tolerate a loss of 4 units.
Source entries
Dependency Distribution Concentration
Dependency distribution concentration Nominal Count versus True Weight Distribution (measurement) supplies the local tension. The setting, alternative arrangements, and stipulated consequences are editorial applications.
Nominal Count versus True Weight Distribution (measurement)
The prime's central insight is that the *count* of providers is not the measure of diversification — the weight distribution is, captured by a concentration scalar (Herfindahl, top-k share, Gini).
Concentration cost versus efficiency gain
Concentration and efficiency trade against each other: concentrated dependency is usually more cost-efficient per unit (volume discounts, learning curves), with the structural cost paid only in tail exposure.