Note that upkeep costs are in Local Credits, NOT Cr Imperial. Living on Heya should be a local cost for Soc 7 — the average for someone capable of getting off world — Each point of soc, using the MT numbers, is LCr250/mo x 13 mo, = LCr3250 per year... or about ImpCr130 per year.
As long as the person in question is content to make do with TL5 artifacts and services. As soon as he wants the same sort of medical care that he got back home, holovision entertainment, book chips, personal computer repairs, etc., cost of living is going to rise. Still, food and lodging alone would be a significant saving.
Noting that apartment rends in 1977 ranged from about $60/week for an efficiency (1 room) to $500/mo for a 2 bedroom (3.5 room), plus utilities (I've done some looking at old newspapers), AND that all the other goods prices match prices found in Popular Science, Popular Mechanics, and Motorweek for 1976-1977...
The minimum wage was $2.20/Hr federally... with an expected 8 hour workday, 5 day week, and 21 workday month. $17.60 per day, x21 days per month, is $369.60/mo expected.
And you're assuming one 1977 dollar is equivalent to a credit, right? I am.
I wouldn't call miminmum wage Soc 7. I'd call that Soc 2 or 3... it was bottom of the barrel at the time...
The four spending levels set out in TB is Starvation Level, Subsistence Level, Ordinary Level, and High Living. Thast would be, what, Soc 1, Soc 2, Soc 7, and Soc 10?
Assuming food and lodging represents 2/3rds of cost of living, we get the following costs:
Starvation level: Cr180 (Might well be less -- a starvation level food and lodging could be practically the only expenses).
Subsistence level: Cr450
Ordinary level: Cr600
High Living: Cr1350
Or going the other way from the MT rules, people would have the following amount for everything else other than food and lodging:
Soc 1: Cr130
Soc 2: Cr200
Soc 7: Cr1350
Soc 10: Cr1600
(If you disagree with my linking between the four expense levels and social classes, what correspondences would you suggest?)
...and that's a good basis for calling it Cr 150 per soc for upkeep... I agree, 250 is a bit high. But not orders of magnitude too high.
I didn't claim it was orders of magnitude too high. I claimed that cost of living going up linearly was too steep at low levels and not steep enough at high levels. The difference between subsistence level and ordinary living is not a factor 3.5.
Calling Minimum wage full time Soc 2 gets Cr250/mo... Food, taxes, clothing, and housing.
Taxes are not relevant to this. Cost of living comes out of take-home pay. If someone is paying 20% tax, he needs to earn 25% more than his cost of living. If he is paying 50% tax, he needs to earn twice his cost of living.
So, looking in striker, the table is LocalCr per capita... and, BTW, shows a cost of Cr10K for militia and Cr20K for Conscripts per annum... and milita and conscripts are traditionally kept at VERY low standards - shared housing at 5-10x civilly acceptable rates... but it also has been EXPLICITLY decanonized. (as has the version in TCS.)
But since no substitute has been provided, I'm going to keep on using those figures until something better comes around.
EDIT: Actually, I'd be happy to dump the Base Income by TL table from
Striker and substitute "The per capita income of a world is by definition Cr10,000 local credits" and then use trade class and currency by starport and TL to establish what they are worth in Imperial credits.
Example: Heya's per capita income would be LoCr10,000 (LoCr = 'Local Credit' (not, as some Imperial wits have it 'Low Credit'

)). With a Class B starport and a TL of 5, a local credit would be worth 0.04 Imperial Credits, modified by trade class, for a final result of CrImp0.077.
That table does, however, work nicely with LocalCr250 if the GDP table is read as ImpCr, not LocalCr. In which case, Heya's ImpCr3840/person works out to LocalCr96000 per annum.
Which would give the average Heyan the income to maintain a social level of 32.
And it's surprising how little some "once wealthy" people actually live on, and yet still maintain their social status.
Sure, but the Cr250/SL rule doesn't take that into account, does it? I still say it is seriously broken in more than one way.
Hans