the cost of ramen in japan at a stall is between 4 to 8 $
general chop's noodles cost between 2,500 to 5,000 dennies
that imples a corrolation of 625 dennies per 1 usd

comparing this to the cat food cost
1 canned cat food at the convenience store is worth 2,500 dennies
irl canned cat food is worth between 1.5 and 3$
the description describes at is as very high end, so 4$ sounds believable

this would make the cost of 100,000,000 (100 million) dennies per square meter of housing in the center of the (last) city (on earth) equal to around 160,000$ per square meter.
compared to the most expensive place on earth, monaco, which is around 15,000$ per square meter, it'd be around 10 times more expensive, which i guess would be believable.

the video store makes 867 dennies an hour, with 131 visitors an hour.
and yes, i know it's just a front. but if it's meant to be representitive of a real business, then the employee-
hmm, wait, just realized i'm implying they work for free. surely 867 dennies is just our cut. then that doesn't help us much in figuring out the average wage in new eridu... not to mention that the profits might be getting split between the siblings... and maybe that's after taxes...

the military pays 4,500 dennies for an investigation mission in the hardest section of a hollow.
granted they pay with a bunch of other in-house stuff, like crystals. but also 24 bangoo widgets, each of which can be "destoryed" for 300 dennies.
this would only make them worth another 7,400 dennies.
but you can destory a certification seal for 400, and the convenience store sells it at 3,200. which is a 700% markup.
thus the market price of those widgets is actually 2,400 each. x24, that's 57,600 dennies, plus the comission money, that's 62,100 dennies... though the military probably gets those widgets on the cheap from TOPS or whoever.
not to mention that we don't know how much each agent gets payed, etc...

hmm.. i feel closer to figuring out the economy, but still far