Decision Library
One supplier versus two is a risk price
A single supplier usually offers the best price, the simplest relationship and the most consistent quality. A second supplier costs money and attention, and earns its keep only on the day the first one fails. The decision is a trade between a saving you see every month and a loss you may never see, until you do.
What single sourcing buys
Concentrating volume with one supplier earns better pricing, priority in tight markets, and a closer working relationship. Quality is easier to hold when one process makes every part, and engineering changes need agreement with only one partner.
These benefits are real and measurable. They appear on every invoice, which is why single sourcing tends to win any comparison that counts only the invoice.
What it risks
The cost of single sourcing is concentration. A fire, a flood, a strike, a bankruptcy, an export restriction or a quality failure at one plant stops your supply entirely. Recovery may take months if a replacement must be found and qualified from scratch.
To compare fairly, estimate what a disruption would cost you, roughly how likely it is in a given year, and how long recovery would take with and without a qualified second source. Even rough figures make the hidden side of the trade visible.
Options between one and two
Dual sourcing is only one defense. You can hold extra stock of critical parts, qualify a second source without placing regular orders, redesign a part so several suppliers can make it, or contract for priority capacity with the current supplier.
Each option has its own cost and its own protection. A qualified but idle second source costs the qualification and little more, and cuts recovery from months to weeks. A buffer covers short disruptions but not long ones.
How the room prices concentration
In a Decision Room each sourcing path gets its own Champion. The Red Teamer runs the disruptions that would break supply: a plant closure, a blocked shipping lane, a sudden tariff. The Gray Wolf looks for hidden dependence, such as two suppliers who rely on the same raw material maker. The engine works your own figures exactly, and the Verdict says which path leads and the conditions that would reverse it. The Human Decision stays yours.
A component at $12 or $12.60
A manufacturer buys 400,000 units a year of a component at $12 from one supplier. Splitting 70 and 30 with a second supplier raises the average price to $12.60, costing $240,000 a year, plus $80,000 once to qualify the second source. A supply stop would halt a product line earning $150,000 of margin a week. If a ten week stop has a 5 percent chance in any year, the expected yearly loss is $75,000, well below the cost of dual sourcing. A qualified but idle second source, costing the $80,000 once and cutting a stop to three weeks, protects most of that loss for a fraction of the price.
Questions
- Is dual sourcing always safer?
- Not always. Two suppliers that depend on the same raw material, region or port share the same weak point. Check the chain behind each supplier before counting them as independent.
- How much buffer stock is enough?
- Enough to cover the time it would take to restart supply from another source, for the parts that would stop production. Holding more costs cash and space with little added protection.
- Does dual sourcing hurt the relationship with the main supplier?
- It can if handled carelessly. Many buyers explain the policy openly and keep the main supplier's share large enough that the relationship remains important to both sides.
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