波动项 · The components that move
Ocean freight is the volatile component, and it is volatile in a way that has nothing to do with the seller. Container rates respond to space and equipment, to bunker cost, to whether the service is direct or transhipped, to blank sailings and to congestion at either end. A seller writing an offer today is either holding a booked rate, in which case the validity will be short and specific, or estimating one, in which case the validity is a risk position that has been priced. Neither is dishonest. They are different offers.
The product is the second mover, because a binder is a refinery output and follows crude, refinery run and yield. The third is finance, which only becomes visible when the tenor is long: an offer against a deferred payment carries the cost of the money across that period and an offer against payment at sight does not.
稳定项 · The components that barely move
Filling, terminal handling, export formalities, inspection, documentation and the seller's margin are effectively fixed inside a quotation period. Terminal charges follow a published schedule of rates. Inspection is a fee schedule. Documentation is a piece of work that is done once and then exists. Inland haulage sits in between: it is rate-based but carries fuel adjustment and seasonal capacity.
The practical consequence is a diagnostic. If two offers differ by a large amount, the difference is very unlikely to be sitting in the stable components, because they simply do not have that much room in them. It is sitting in the product, in the freight, or in something structural that has not been aligned. Which is worth checking before anybody is accused of overcharging.
三个分母 · A CFR number is quoted per tonne but is not built per tonne
The deepest reason two honest offers diverge is not volatility at all. It is that a CFR quotation is presented as one figure per metric tonne while the costs underneath it accumulate on three different denominators, and the conversion between them is done by the seller, silently, before the buyer ever sees a number.
Per tonne of binder. Only the product genuinely behaves this way, and even it needs two questions answered before the denominator is real. Is the price per tonne of net product, or per tonne gross including packing — on drums the steel is real weight, and the tare treatment belongs in the offer rather than in a later conversation, which the drummed cargo page follows through to the Chinese customs declaration. And where is the quantity determined: weighed at the load port, or counted as units multiplied by a nominal fill? Those are two different numbers and only one is a measurement. On a bulk parcel the same question becomes a temperature question, and the bulk page sets out the quantity clause.
Per container. Ocean freight and terminal handling on containerised cargo are charged per box, not per tonne, so the packing decides the freight share of every tonne before any rate is quoted. A 20-foot FCL carries 12 MT as 80 drums of 150 kg, 14.4 MT as 80 drums of 180 kg, 14.8 MT as 80 drums of 185 kg, 20 MT as 20 one-tonne bags, and 20 to 25 MT in a bitutainer. Read those as divisors rather than as loading data: the same freight rate spread over 12 MT and over 20 MT gives two very different freight components per tonne of binder. A drummed offer and a bagged offer for identical material at an identical margin are structurally required to be different numbers.
Per shipment or per batch. This is the denominator nobody converts, and it explains the arguments that survive after packing has been aligned. Export formalities, the document set, the load-port survey and the laboratory schedule are largely indifferent to how much bitumen is being shipped — a wax determination costs what it costs whether it sits behind one container or forty, and a Chinese-format safety data sheet is prepared once and then exists. On a small parcel those costs land on few tonnes and lift the per-tonne figure; on a large parcel they disappear into the rounding.
Two consequences follow, and they cut in both directions. A buyer who prices a trial container and then expects the same figure at volume has misread which denominator he was quoted on. And a buyer comparing a one-container offer against a multi-container offer is comparing two positions on the same cost curve, not two suppliers — which is why tonnage belongs in the enquiry rather than in the negotiation afterwards. Ask both sellers for the same tonnage, in the same packing, or the arithmetic is not about them at all.
有效期 · Validity is part of the price
A validity is not administrative housekeeping. It is a statement about how long the seller will hold the volatile components at his own risk. A short, dated validity usually means the freight is booked or firmly indicated and the number is tight. A long validity across a moving freight market means one of two things: the risk has been priced into the number, which makes the offer legitimately higher, or it has not been priced, which makes the offer unlikely to survive to acceptance. A buyer who chases the longest validity and the lowest number at the same time is asking for the version that does not survive.