Not long ago I was talking to another friend of mine — also an Amazon seller — who told me they had recently switched from buying through a local distributor to ordering directly from a manufacturer in China.
Their reasoning felt familiar:
"It's cheaper there, so overall it should be more profitable."
I asked what I thought was a simple question:
"Did you calculate how much cheaper it really needs to be to justify waiting eight weeks instead of five days?"
They hadn't. And in fairness, most sellers don't.
Lead time is usually treated as a logistics parameter, not a financial one.
But once you understand how capital behaves, the picture changes entirely.
The Common View: Lead Time as Just a Shipping Delay
Restock tools typically treat lead time as a purely operational parameter.
They start by looking at questions such as:
- •What is your current sales velocity?
- •How much inventory do you have on hand?
Given a specified lead time, they then determine:
- •How long the next shipment will take to arrive and when the next order needs to be placed.
This logic helps avoid stockouts and unnecessary storage — perfectly valid operational goals.
But it answers only one question:
"When will I need more stock?"
It does not answer the more important financial question:
"What does this lead time do to my capital?"
And that's where many sellers unknowingly lose money.
Why "Cheaper in China" Doesn't Automatically Mean "More Profitable"
In my friend's situation:
- •Local distributor: delivery in ~5 days
- •Chinese manufacturer: delivery in ~8 weeks
- •Cost in China: lower
- •Decision: "lower cost = better margin = better choice"
On paper, it looks correct. In reality, it depends on how effectively your capital works during those extra weeks.
Because the real question is not:
"Is it cheaper?"
but:
"What is the best way to allocate my limited capital?"
More specifically:
"Is the higher margin enough to justify locking my money for eight weeks instead of five days?"
"Will the expected return on investment cover my cost of capital?"
That's the comparison most sellers never make.
While You Wait 8 Weeks for 'Cheap' Stock, You Might Sell the 5-Day Stock Several Times
This is the part that becomes obvious once you hear it — and somehow invisible until someone points it out.
While the cheaper shipment is on the water for eight weeks, you could order from the local distributor, sell out, reorder again, and repeat this cycle several times.
Yes, the margin per unit might be lower. But your capital turns faster — and therefore earns money more often.
A slow but cheaper option can look attractive in isolation. But when compared to a fast cycle, the fast option can outperform simply because:
Lower margin × multiple fast cycles can beat Higher margin × one very slow cycle.
This is where many sellers unintentionally choose the financially weaker option while believing they chose the stronger one.
The Hidden Issue: Lead Time Never Appears in Warehouse Metrics
This is something I've consistently seen as a CFO.
All standard inventory metrics — days of supply, inventory turnover, sell-through rate, inventory age, days of inventory outstanding — start counting only when the product arrives at the warehouse.
But the financial effect of lead time begins much earlier:
Your money is locked the moment you place the order — long before the product appears in any metric.
This is why two suppliers can look identical in operational dashboards while being completely different in how they affect your cash.
Lead time is invisible in inventory metrics, but financially it changes everything.
Lead Time Determines Capital Allocation — Not Just Stock Availability
When you place an order, you make an investment.
From the moment you pay the supplier until the moment the product sells (and marketplace releases the payout), your capital is tied up.
Lead time affects:
- •how long your money remains unavailable,
- •how many inventory cycles you can complete,
- •how much working capital your business needs,
- •and how quickly you can react to demand changes.
A long lead time may still be acceptable — but only if the higher margin truly compensates for the longer capital lock. A short lead time may be far more profitable — even if the margin looks worse on paper — because your capital works more times per year.
This is the difference between operational thinking and financial thinking.
Why Lead Time Can Completely Change Your Supplier Ranking
If you compare suppliers only by price or unit margin, the cheaper one will almost always look better.
But once you account for lead time — the ranking often reverses.
For one SKU, switching to China makes sense. For another, it quietly reduces your return on investment, even though the per-unit margin is higher.
This is why the right question is not: "Who gives me the best price?"
but: "Where does my capital work more effectively?"
The answer is rarely obvious without looking at lead time as a financial variable.
The Bottom Line
Lead time may look like a logistics detail. But in reality, it is one of the most important financial levers in your business.
Ignoring this leads to decisions that look profitable on paper but weaken your capital efficiency.
Including it in your analysis makes your replenishment strategy far more effective.
In the previous article, Why Restock Tools Miss the Point: You Can't Separate Margin From Inventory Turnover, we looked at why margin and inventory turnover must be evaluated together when making restocking decisions.
In the next article, Cost of Capital — A Critical Factor in Working Capital Investment Decisions, we'll examine why the cost of capital sets the minimum return threshold for working capital investments.