They will just wait for the next ship that will take it at cost, unless it is time critical, in which case they may pay more.
Or there's always the charter option.
A third party "buys out" the load capacity of a starship (at 90% cost for that capacity) and basically gets to have that starship at the third party's "beck and call" for interstellar shipments.
Consider that a mainworld may have what amount to "seasonal exports" (think agricultural products, if it helps) and that third parties on that mainworld are eager to have a standing contract (for charter) at particular times of the year when the "bumper crops" of whatever commodity get harvested.
If there are no interstellar exports, that means that (see: supply/demand theory) the prices for that commodity will "fall" in that local market due to an oversupply. However, if there are interstellar exports, the supply side of the equation can be "moderated" and producers can simply export the "excess" beyond what is needed/demanded by the local economy for sale elsewhere. So instead of the government subsidizing the producers of the goods for export, the government subsidizes starship operators in order to export goods to help stabilize the local world economy.
Or to take a different (real world) example in durable goods, rather than in perishable agricultural products ... the TESLA factory in Shanghai operates on a "cyclical" basis of production for the domestic market (in China) and the export market (Europe, Canada/Mexico, SE Asia, Australia/New Zealand, etc.). So when looking at production on a monthly rather than quarterly (or annual) basis, some months in a quarter are dedicated primarily to producing for the export market (when the transport ships are available) and some months are dedicated primarily to the domestic market. The production "run rate" of the factory is "relatively stable" while the destination for most of the products coming out of that factory VARIES from month to month (domestic consumption vs foreign export). It then becomes possible for third party transport services to "anticipate" when demand for transport services will be needed for foreign distribution and plan the movements of their transport assets accordingly to meet those needs for export capacity.
When you can reach the point of "predictable demand for export services" that's when third parties can start to step in as middlemen to organize charters of transports, so as to create a predictable demand for services.
Ideally speaking, in CT terms, you wind up with a subsidized starship that spends a LOT of each year (~70%?
) operating under charter contracts, to meet "predictable" home port export/import needs. The "remaining" portion of the year (~30%?
) the starship is free to do tramp trading and engage in speculative goods arbitrage.
But RAW doesn't allow for purchasing through-shipment, just one jump at a time.
NOT TRUE.
All that is required is for a starship to DECLARE ITS DESTINATION(s) to enable multi-jump shipments. The written example cited earlier expressly called out and highlighted intermediate destinations when explaining how tickets work.
Bold text added to highlight what people ought to be paying attention to.
LBB2.81, p4:
Interstellar travel is priced on the basis of accommodations; prices cover a trip from starport to starport, encompassing one jump, regardless of length.
LBB2.81, p9:
Differences in starship jump drive capacity have no specific effect on passage prices. A jump-3 starship charges the same passage price as a jump-1 starship. The difference is that a jump-3 ship can reach a destination in one jump, while the jump-1 ship would take three separate jumps (through two intermediate destinations, and requiring three separate tickets) to reach it. Higher jump numbers also may make otherwise inaccessible destinations within reach. But for two ships of differing jump numbers going to the same destination in one jump, each would charge the same cargo or passage price.
RIP ticket pricing per parsec in CT (because GURPS is a different system).
If a starship declares, in advance, where it is going for its next 3 jumps. it can get passengers and freight tickets bound for any of those next 3 destinations ... not just the next 1. However, by "committing" to those additional destinations beyond the first, any deviation from that "plot" is going to cost the operator, because the operator is still going to be bound by contract (see: tickets) to deliver passengers and/or freight to those destinations (you still have to deliver, but if you "take the long way round" you're not getting any extra ticket revenues for deviating from your pre-planned route). So if you deviate from your plot, your revenue tonnage remains "occupied" (assuming you don't "dump" it somewhere rather than deliver it) and you don't get any new ticket revenues while that revenue tonnage remain "undelivered" to the intended destination(s).
Good luck Rules Lawyering™ your way out of the obvious, clear and repeatedly stated intent for how tickets are supposed to work (per jump, NOT per parsec) in CT.
The rules tell you what is available now to be shipped now.
Even more to the point, the RAW tells you what is available to be transported aboard YOUR starship only, depending on where you plan (and declare, in advance) that you are going to be going.
If you have a "set" route that you follow, without deviations, this means that you can basically keep your manifest full at all times.
Why?
Because you can declare "all" of your successive destinations AT EACH port of call.
You aren't just selling tickets to the "next stop" along your route, you're selling tickets to ALL OF THE STOPS along your route simultaneously.
Think about it in terms of a J1 Free Trader operating along a J1 Main somehwere.
- Destination 1: 2 high passengers, 6 low passengers, 30 tons cargo
- Destination 2: 1 middle passenger, 4 low passengers, 10 tons cargo
- Destination 3: 3 high passengers, 10 low passengers, 40 tons cargo
With that, your manifest is functionally "full" even though no single destination is claiming more than 50% of your revenue tonnage capacity. But you're leaving your point of origin with what amounts to a full shipping manifest ... you just need to commit to (and declare) enough destinations in advance to fill up your shipping manifest and then "refill" with new tickets as you deliver along the way, in effect "rolling over" your revenue tonnage on a somewhat continuous basis.
I figure that THIS (multi-destination planning) is what most J1 Free Traders wind up needing to do along otherwise "uninviting stretches" of J1 Mains (such as the journey between Regina/Regina to Equus/Lanth) in order to keep their manifests full for the length of their journey through economic backwater regions (the Spinward Main through Lanth subsector has TWO of these low population "dead zones" along the way).
This kind of operational model is not cleanly compatible with tramp trading ... let alone tramp speculative goods arbitrage trading.
Tramp trading means "letting the economic winds blow you towards your next destination" from each delivery point. You aren't planning more than 1-2 destinations in advance (with 1 being the most common). As a tramp trader, when you arrive you discover what needs to be shipped where and then choose the option that provides the most revenue for your ship based on that demand at each starport. You aren't "planning ahead" to be anywhere in particular, you're just "going with the flow" of whatever looks like the best deal for your operation at each decision point.
Tramp speculative goods trading is advantaged by NOT having a pre-planned route in mind. That's because if you're able to score a cheap purchase on a lot of speculative goods, you want to be able to alter course to the best destination to sell that lot of speculative goods at the most advantageous arbitrage price. Having a pre-planned/set route interferes with that goal of turning around speculative goods for arbitrage profits at the highest possible operational tempo.
And it's at THIS point that the details of maps and the "arrangement of trade codes" to engage in tramp speculation arbitrage starts becoming incredibly important.