Every Line Item in a Kakobuy Order, Priced Out

Six lines separate the price written on a spreadsheet row from the amount a parcel finally costs, and four of them carry editable defaults ($1.40 per item, 5%, 3% and $45) rather than quoted prices. The order of the lines matters because each one is computed on a different base. Two of them are percentages of the item subtotal, one is a fixed amount per item, one is a single figure for the whole parcel, and one is a consequence of the destination row rather than an input at all. Reading a total without knowing which lines were computed on what is a common way to misjudge a quote.

The first line is the item subtotal, the sum of the prices recorded for the items in the order. The second is domestic shipping, charged per item and defaulting to $1.40 per item, which is the cost of moving goods from a seller to the warehouse inside the source market. The third is agent commission, a percentage of the subtotal and not of the subtotal plus shipping, defaulting to 5%. The fourth is a payment surcharge, also a percentage of the subtotal, defaulting to 3%. The fifth is international freight for the parcel as a whole, defaulting to $45 and driven in practice by billed weight. The sixth is destination tax and handling, which exists only above the threshold published for the destination.

Two structural facts follow from the bases. First, commission and the payment surcharge are both computed on the subtotal, so they scale together: an agent that halves its commission while keeping the same payment surcharge removes only part of the fee load. Second, line five is the only line that responds to weight, and line six is the only line that is binary. Every other line moves smoothly with the value or the count of what was bought.

One further property is easy to miss: the order of the lines is not the order of their size. On a four-item parcel of median-priced goods the subtotal dominates, but among the editable lines freight is the largest single figure in the worked example below, and the two percentages together are usually second. A buyer who reads the waterfall from the top down and stops at the fee lines optimises the smaller half of the controllable total, which is why the worked comparison later in this note separates the freight line from the fee lines rather than reporting a single saving.

Lines one, three and four respond to the same lever: the subtotal. Commission and the payment surcharge are percentages of it, so any reduction in the subtotal reduces all three at once. That is also why fee-tier shopping is worth less than it looks. On a $180 subtotal the difference between a 5% commission and a 3% commission is $3.60, which is 1.8% of the $200 agent-side total. The published rows are tabulated below.

Line one responds to the composition of the parcel rather than to negotiation. Category medians in this ledger run from $16.22 for Headwear to $68.68 for Shoes, and the Accessories category runs from $5.17 to $451.10, the only range of the eight that spans more than fifteen times. A parcel assembled from Headwear and T-shirts therefore carries a smaller subtotal, and therefore a smaller commission and payment surcharge, than one assembled from Shoes and Jackets at the same item count. The percentages scale with that choice automatically, which makes the subtotal the only lever that moves three lines at once.

The crossover between a percentage tier and a per-item tier is worth computing once, because it turns out to be independent of basket size. A 5% commission costs 0.05 times the average item price for every item, and a fixed fee costs $1.50 per item, so the two are equal when the average item price is $30.00, no matter how many items travel. Below that average the percentage tier is cheaper; above it the fixed fee is. Against the 3% tier the same calculation puts the crossover at $50.00. The ledger median item price of $31.76 sits just above the 5% crossover, which means a parcel of median-priced items sits close enough to the line that neither structure is obviously wrong.

The fixed-fee row is the interesting one, because it changes shape rather than level. At $1.50 per item across four items it costs $6.00, which lands between the two commission tiers on this parcel. That outcome is not a coincidence of parcel size: as the crossover calculation above shows, the comparison depends on the average item price rather than on the item count. A parcel of cheap items favours the percentage tiers at any basket size, and a parcel of expensive items favours the flat fee at any basket size. The instrument at /instrument/agent-fees/ exposes exactly this, and it excludes the unpublished row from every total rather than guessing at fields that were never published.

Line two, domestic shipping, is the line most easily mistaken for a fixed cost. It is not fixed, but it is small: at $1.40 per item across four items the line is $5.60, and halving the per-item rate saves $2.80. Line five, international freight, is the largest editable line on the worked parcel below. At a $45 default it exceeds the entire fee load of the standard tier on this parcel, and unlike commission it responds to a decision the buyer makes after everything has been bought.

Line six is not reducible by editing. It appears when declared value crosses the threshold on the destination row, and the amount is a percentage of declared value plus a handling charge where the row carries one. Because it is a percentage of the whole value rather than of a fee base, it is the only line whose appearance can exceed every other editable line combined. The German and Polish rows both use a €150 threshold at 19% and 23% respectively, with a €6 handling charge confirmed on the German row only.

The same four-item parcel with a $180 subtotal can be priced several ways without changing what is inside it. The rows below use the instrument defaults and then change one editable line at a time, so each difference is attributable.

The comparison produces one clear result and one clear non-result. The non-result is that fee-tier shopping is worth little on a parcel of this size: the best tier saves $3.60 against the standard one, which is 1.8% of the standard total. The result is that the two lines a buyer usually treats as immovable are worth more. Reducing freight from $45 to $38 saves $7.00, and reducing domestic shipping from $1.40 to $0.80 per item saves a further $2.40. Together those two edits save $9.40, which is more than two and a half times the fee-tier gain and requires no change of agent at all.

The order in which to attack the lines follows directly. Freight first, because it is the largest editable line on this parcel and it responds to packing and to line choice. Domestic shipping second, because it multiplies by item count and is invisible in per-order thinking. Fee tier third, because the spread between published tiers is small on ordinary baskets and only becomes decisive at the extremes of item count. Tax last, because it is not editable and is the line that punishes a total assembled without checking the destination row.

Each edit also has a different durability. A negotiated freight figure applies to one parcel and has to be negotiated again on the next one. A fee-tier change applies to every future order but saves the least per order. A packing habit that lowers billed weight applies to every parcel without renegotiation, which is why weight work pays across orders while a single freight discount pays once. Ranking the three by durability rather than by dollars reverses the order that the table above suggests.