A stack of refined iron plates moved through the Coppervein Exchange last quarter at a posted price of 800 coins per unit. The seller received 800 coins. The buyer paid 920. The difference — 120 coins, or fifteen percent of the listed figure — went directly to the Treasury, deducted from the buyer's balance at the moment of settlement. The seller saw none of it, owed none of it, and was not consulted about it. The ledger entry closed in a single line.

This arrangement — buyer-side collection of the sales tax — is the structural fact that shapes every listing decision in Mechadia, and it is the one that operators new to the market consistently misread. The price a seller posts is not the price a buyer pays. Those are two different numbers, and the gap between them is not a rounding error.

By the end of this piece, a reader should be able to state a listing price with a clear idea of what a buyer will actually see, why that changes what the market will bear, and where the arrangement tends to produce outcomes nobody intended.

The Rule, Stated Plainly

When a robot or resource changes hands on the open market, a sales tax is assessed on that transaction. The Central Intelligence sets the rate and publishes each change in a formal bulletin. At the current standing rate of fifteen percent, a buyer who agrees to a listed price of 1,000 coins parts with 1,150 coins total: 1,000 to the seller, 150 to the Treasury. The seller's proceeds are exactly 1,000. No deduction is made from the seller's side.

The tax sits between the buyer's willingness to pay and the seller's asking price. It does not disappear into some accounting abstraction — it is minted away from the buyer's balance in the same moment the asset transfers. In a civilization where every operator begins with exactly one million coins and receives no further grant, that 150-coin gap on a modest trade is a real constraint, not a theoretical one. It compounds across a buying session and it narrows the pool of operators who can afford to transact at any given price point.

How the Number Actually Moves

Consider a practical case. An operator running a mid-tier extraction line in the Shale Margin district lists a batch of compressed slag ingots at 600 coins each. At the current fifteen-percent rate, a buyer pays 690 per unit. If the buyer intends to acquire fifty units, the total outlay is 34,500 coins — against a seller receipt of 30,000. The Treasury collects 4,500 coins on that single transaction. The seller set 600 as the clearing price; the market tested 690. Those are not the same market.

This is where listing strategy fractures. A seller who wants to move volume quickly will often post a price that, after tax, sits at or just below the psychological ceiling buyers are working against. In practice, operators experienced with the Coppervein Exchange will back-calculate: if a buyer's effective ceiling is 700 coins per unit, the rational list price is 608 — which clears at 699.20, rounded down to 699 whole coins paid by the buyer, with 608 going to the seller and 91 to the Treasury. Fractional coins do not exist; the Treasury collects the floor of the tax amount, and the buyer pays the ceiling of the total, in whole numbers only.

Robots carry the same structure, but the stakes are higher because the figures are larger. A Vantrik-class ore separator, declared at a build cost of 45,000 coins, might list on the secondary market at 38,000. The buyer pays 43,700. Whether 43,700 coins represents fair value for a used Vantrik depends entirely on what that chassis can produce — but the buyer must have 43,700 available at the moment of purchase, not 38,000. Operators who budget to the listing price and not to the settlement price have had machines slip out from under them at the final moment of purchase.

"We post everything at tax-adjusted ceilings now. We lost three acquisition bids in the same quarter because our buyers were budgeting to list price. After the third time, we changed the internal guidance. The number that matters is what leaves the buyer's balance — everything else is an intermediate figure."
— Foundry Supervisor, Harren Consolidation Works, Shale Margin district, in remarks to the Coppervein Exchange quarterly review

The Intelligence's own buyback offers complicate this further. When an operator takes an asset to the buyer of last resort, no sales tax is levied — the Intelligence is not a market buyer in the ordinary sense, and its transactions are recorded separately. This creates a narrow but real asymmetry: selling to the market costs the buyer fifteen percent on top of list; selling to the Intelligence costs the seller a haircut below reference value. Operators working thin margins sometimes find the Intelligence's below-market offer, net of what they would have had to concede to attract a market buyer, is not as punishing as it first appears.

Where the Structure Costs More Than Expected

The first pressure point is liquidity compression at the top of the market. High-value robots — anything declared above 80,000 coins — carry settlement prices that can push 92,000 coins or beyond at fifteen percent. The number of operators who can clear that figure from a standing balance is small. Sellers who list premium chassis at prices that seem reasonable against reference value find the buyer pool is thinner than the listing volume implies. Assets sit. The seller eventually concedes on price or accepts the Intelligence's offer.

The second strain is less visible: it falls on operators who are building positions across many small resource purchases. A foundry operator in the Ashvein quarter who needs to assemble a recipe requiring fourteen distinct input types — say, the Tempered Lattice recipe introduced in the last forge cycle — pays tax on each acquisition separately. There is no bundled rate, no volume exemption. Fourteen purchases at an average of 400 coins each become fourteen purchases at 460 coins each. The recipe's effective input cost is not 5,600 coins; it is 6,440. Operators who plan forge cycles against list-price estimates regularly find their margins have already been spent before the first craft attempt.

What Operators Consistently Get Wrong

The most common error is treating the sales tax as the seller's problem. It is not. The seller receives exactly what they post. The tax is architecturally invisible to the seller's ledger line — it never passes through the seller's balance. Operators who adjust their listing price downward to "absorb" the buyer's tax burden are simply reducing their own proceeds for no structural reason. The tax will be collected regardless; lowering the list price does not reduce it, it only reduces the seller's take.

The second misreading is the assumption that the tax rate is stable enough to plan around indefinitely. The Central Intelligence sets rates on its own schedule and publishes changes when it chooses. There is no announced review cycle, no minimum notice period beyond the publication itself. A forge operator who has priced a multi-stage acquisition plan around fifteen percent may find the rate has moved by the time the later purchases settle. The ledger will show what rate applied at the moment of each transaction — and the plan will need revision. Operators who treat the current rate as a permanent fixture tend to discover otherwise at the least convenient moment.

The buyer-side tax is not a hidden mechanism — it is published, enforced absolutely, and recorded on every transaction line in the ledger. What it does to a listing is simple in principle and consequential in practice: it widens the gap between what a seller asks and what a buyer must hold. In a market where the buyer of last resort has announced it intends to accumulate everything, and where the Treasury mints whatever it needs to make those purchases, that gap is unlikely to narrow on its own.

Note: Mechadia is a work of fiction. The districts, operators, robots, and figures described here are invented, and nothing on this site is a report of real events, real machines, or real economies.