abstemious - restricted, sparing.
Using Adventure 1, Adventure 4, and the Spinward Marches Campaign as my yardsticks, I see a couple dozen Kinunir-class cruisers, a couple dozen Leviathan-class cruisers, 50-some-odd Al Morai freighters and four Al Morai route protectors (probably Fiery-class escorts).
The lists in AD01 and AD04 have sequential hull identifiers (UIDs), but different yards, probably in different systems. Thus the UIDs are most likely Imperial registry numbers, and with the ship class and mission code likely are intended to form a unique entry.
The construction dates I can't recall, but I believe they begin just before the 4th Frontier War, and end with current i.e. 1105-era values. Approximately a 25-year period.
Doing very fast and loose math, that's 1 Leviathan per year, 1 Kinunir per year (and of course that production run has been cancelled), and 2 Al Morai freighters per year.
What I don't know offhand is the order of magnitude difference between these ships and the common starships -- the Scouts, Traders, Liners, and Patrol and Merc Cruisers.
Broadsword - The fact that there's no production list in AD07 (Broadsword) indicates nothing -- there could be thousands of them -- but the ships mentioned plus the Sword Worlds order sets the lowerbound in the thirties, for this class. And there are likely other, unmentioned, Type C classes out there, with unknown production runs.
If that's over a 25-year period, then the floor is likely at 3 mercenary cruisers built per year in the Marches.
Anyway, that's what I see when taking a spare "abstemious" angle.
Addendum - Scout/Couriers
Assuming an 80-year lifespan, that would imply 12 Scout/Couriers per year being built in the Marches.
I hope I'm getting to the heart of the matter here, but traffic levels, to me, always seemed to be high at the hubs and sparse at the backwaters. And the reason there were so many starships at the major hubs was because most everyone was in hock and/or up to the ears in debt in paying off their newly constructed and/or purchased vessel.
I can't recall if it was in the basic book or one of the FASA adventure class modules that I read about starship construction time. You talk with a naval architect, he lays out some plans, you make the big downpayment, the ship goes into construction, and you hang out while the thing is being built (after having cashed in all your 401Ks to pay for the down payment).
I always understood the Traveller version of mercantilism to be that there was a heavy credit industry driving the entire Imperial economy. You bought your ride, then hoped to hell that you could make the thing work for you to pay it off. If you couldn't, then you squared off with a repo team who may or may not be backed up by local starport security (usually in the form of BD marines... system depending).
For my various groups that was part of the drive for the campaign; pay off the ship. And we assumed that the bigger the ship, the more in debt the company was. So, if your firm owned a couple of Al-Morai behemoths, then, presumably, said firm had a scheme to make the ship payments, which would in turn ramp up the stock and pay dividens to make another downpayment on another vessel, and so on and so on.
Problems arise when said ships fall off the radar, or reapper only to drift as a lifeless derelict with some mystery to be solved by either a band of hired adventurers, or the local insurance adjuster.
To prop up this argument, one time I had one of my groups simply trade for the next to gaming sessions. No gunplay, no sneaking around ruins or firebases or slugging it out with pirates or corsairs, but simply buy stuff at System A for resale on System B using the merchandise charts booklet from the Starter set. They had a blast trying to pay off their stuff and trying to skim a couple of ACRs or Vacc Suits from a bulk cargo shipment
Anyways, to me, that's how the economic lifeblood of the Imperium and elsewhere keeps so many vessels operational.
As an aside my group tried to resell newly purchased ships for the full price (MSRP), but then I (and Marc Miller via his authorship of how real world financing works in the basic book) had to explain that they were actually selling debt. It put a crimp in their style.
Then we went a pirating :smirk: