What it means
In business operations, companies must decide how many suppliers they will use for their materials, software, and services. A single source arrangement means that despite having multiple choices in the wider market, management deliberately selects one specific vendor to supply a particular need.
This is different from sole source purchasing, where only one supplier exists in the entire market for a patented or unique item. Choosing to rely on one provider requires a high level of trust and often involves signing long-term contracts.
From a financial perspective, single sourcing offers several clear advantages. By concentrating all your purchasing power with one supplier, you can negotiate much better volume discounts and lower unit costs than if you split your orders across several vendors.
It also reduces administrative expenses, because your finance team only has to process invoices from one supplier, manage one contract, and deal with one point of contact. Furthermore, working closely with a single provider makes communication smoother and can lead to higher quality, as the supplier gets to know your exact business needs over time.
However, this strategy introduces notable financial and operational risks. If your chosen supplier faces financial trouble, labour strikes, factory fires, or delivery delays, your entire operation could grind to a halt because you have no immediate backup.
Without competitors vying for your business, a single supplier might also gradually increase prices over time. Therefore, finance and procurement managers must carefully weigh the cost savings and efficiency gains against the potential risks of supply chain disruption before committing to a single source model.
Using a single source is like buying all your groceries from your favourite local farm shop. You get to know the owners well and enjoy loyal customer perks, but if their crops fail, you have to scramble to find food elsewhere.
In practice
Real-world examples
Example 1
A tech startup buys all its cloud servers from one provider to secure a 15% volume discount and simplify monthly IT billing. The finance team now reviews one invoice instead of several, which makes cost forecasting much easier.
Example 2
A boutique bakery purchases its speciality flour from a single local mill, ensuring consistent taste for its award-winning bread. The owner and the miller speak weekly, so the mill plans its production around the bakery's busy seasons.
Example 3
A mid-sized logistics firm leases its entire delivery van fleet from one manufacturer to streamline maintenance and spare parts costs. The manufacturer services all the vans under one contract, which reduces downtime and paperwork.
Think of it
Using a single source is like buying all your groceries from your favourite local farm shop. You get to know the owners well and enjoy loyal customer perks, but if their crops fail, you have to scramble to find food elsewhere.
Formula
Calculation
Total Procurement Cost = (Units Purchased x Price per Unit from Single Supplier) + Administrative Order Processing Cost
Example: 10,000 units at $5 each plus $1,000 in admin costs equals (10,000 x 5) + 1,000 = $51,000 total.
Compare this with splitting the same order across three suppliers. Each supplier charges $5.50 per unit because the orders are smaller, and each adds $1,000 in admin costs. The total is (10,000 x 5.50) + (3 x 1,000) = 55,000 + 3,000 = $58,000. The single source option is cheaper by 58,000 - 51,000 = $7,000, but the saving must be weighed against the risk of having no backup.Case study
Seen in the real world
This is a fictional, illustrative scenario. GreenLeaf Cosmetics, a growing skincare business, decided to streamline its packaging by moving to a single source supplier for all glass bottles and jars. Previously, GreenLeaf used three different packaging vendors, which led to frequent administrative headaches, mismatched bottle caps, and high shipping fees. By consolidating all glass purchases with one manufacturer, GreenLeaf negotiated a 12 percent price reduction per unit. This reduced their annual packaging spend from $100,000 to $88,000.
Additionally, processing invoices from one supplier instead of three saved the finance team roughly ten hours of administrative work each month. However, during the second year, the supplier suffered a major factory delay due to equipment failure. Because GreenLeaf had no backup supplier in place, production halted for three weeks, leading to delayed customer orders and a temporary dip in monthly revenue. The company learned a valuable lesson about balancing cost savings with operational risk, prompting them to keep a backup supplier on retainer for future needs.
Watch out
Common mistakes
- Confusing single sourcing with sole sourcing, forgetting that other market options actually exist.
- Failing to negotiate volume discounts despite giving a supplier 100% of your business.
- Neglecting to monitor the financial health of the chosen supplier, leading to sudden supply shocks.
Questions
People also ask
What is the difference between single source and sole source?
Single source means you choose to use one supplier even though other options exist in the market. Sole source means there is only one supplier in the entire market who can provide that specific item.
Why would a company take the risk of using only one supplier?
Companies use this strategy to secure lower prices through bulk buying, reduce administrative costs, and build a close, collaborative relationship with a trusted vendor.
How can a business protect itself when using a single source strategy?
Businesses can protect themselves by signing strong contracts with penalty clauses for late delivery, conducting regular financial checks on the supplier, and identifying backup vendors just in case.