What it means
When running a business, it is normal to build close relationships with key vendors. However, if you purchase most of your materials or services from just one company, you have high supplier concentration.
This puts you in a vulnerable position. If that single supplier experiences a factory fire, goes bankrupt, or decides to raise prices significantly, your business could grind to a halt overnight.
You lose your bargaining power because the supplier knows you cannot easily walk away to find an alternative. From a financial and operational perspective, monitoring supplier concentration helps managers spot hidden vulnerabilities before they turn into crises.
Investors and lenders also look closely at this metric. If a bank sees that a small business relies on a single supplier for ninety percent of its inventory, they will view that loan as a high risk and might deny funding or charge higher interest rates.
In practice, managing supplier concentration involves tracking the percentage of total spending allocated to each vendor on a regular basis. If a company finds it is too dependent on one source, managers will actively seek out secondary or backup suppliers, even if the primary vendor offers slightly cheaper rates.
Spreading purchases across multiple suppliers adds resilience to your supply chain and keeps pricing competitive. Supplier concentration is like putting all your eggs in one basket.
If you drop that single basket, every egg breaks. If you distribute your eggs across several baskets, dropping one only causes a minor inconvenience.
In practice
Real-world examples
Example 1
A trendy fashion startup buys all its specialised fabric from one mill in Italy. When a sudden port strike blocks shipments, the startup cannot fulfil any customer orders, leading to massive revenue losses and angry buyers. It then has to pay for expensive air freight from a second mill that it has never used before.
Example 2
A mid-sized bakery sources all its organic flour from a single local farm. After a severe frost destroys the farm's harvest, the bakery must scramble to find new flour, paying double the price and ruining its profit margins. A small standing order with a second farm would have cost little and covered most of the gap.
Example 3
A software development agency relies entirely on one cloud hosting provider for all client apps. When that provider suffers a major outage lasting two days, every single client's website goes offline simultaneously. The agency pays service credits to clients and spends the following quarter designing a second-provider backup.
Think of it
Supplier concentration is like putting all your eggs in one basket. If you drop that single basket, every egg breaks. If you distribute your eggs across several baskets, dropping one only causes a minor inconvenience.
Formula
Calculation
Supplier Concentration Percentage = (Spending with a Single Supplier / Total Spending on All Suppliers) x 100
Worked example. Your bakery spends $80,000 a year with one flour mill out of $200,000 total supplier spending, so concentration is ($80,000 / $200,000) x 100 = 40%.
You can also measure your top three suppliers. If the next two suppliers receive $50,000 and $30,000, the top three together account for $80,000 + $50,000 + $30,000 = $160,000, which is $160,000 / $200,000 x 100 = 80% of spend. A figure that high means three relationships carry most of the business risk.Case study
Seen in the real world
This is a fictional, illustrative scenario. GreenHome Products, a mid-sized manufacturer of eco-friendly cleaning items, relied on a single overseas supplier for its specialised spray nozzles. This single vendor accounted for 85% of GreenHome's total component purchasing budget. Management felt comfortable because the pricing was exceptionally low and shipments arrived on time for three straight years.
Trouble began when the overseas supplier faced severe local labour shortages and sharply increased its prices by 40% with only two weeks' notice. Because GreenHome had no alternative suppliers lined up and no time to vet new ones, leadership had no choice but to accept the price hike. To make matters worse, production delays at the sole vendor caused GreenHome to miss major retail delivery deadlines for the autumn shopping season, resulting in cancelled orders and a 30% drop in annual profit. Following this near-disaster, GreenHome restructured its procurement strategy.
They capped any single supplier at 30% of total spend, onboarded two backup vendors for critical parts, and successfully protected the business against future supply chain shocks. To see the exposure, suppose the annual component budget was $500,000. The nozzle supplier received 85% of it, or $425,000, so a 40% price rise added $425,000 x 40% = $170,000 to annual costs. Under the new 30% cap, no supplier could receive more than $150,000, so the same 40% increase would add at most $60,000.
Watch out
Common mistakes
- Assuming the cheapest supplier is always the best choice, ignoring the hidden costs of high dependency.
- Failing to review supplier concentration until a crisis actually happens.
- Confusing having multiple contracts with having multiple truly independent supply sources.
Questions
People also ask
What is considered a safe level of supplier concentration?
As a general rule, try to ensure no single supplier accounts for more than 20 to 30 percent of your total purchasing budget.
How often should I review my supplier concentration?
You should review your top suppliers at least once a year, or whenever you plan to scale up production significantly.
What should I do if I have high supplier concentration?
Begin researching and testing alternative vendors to build a secondary supply chain, even if their initial prices are slightly higher.