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Problem is that 2072 Shadowrun doesn't really use cash anymore. This makes no sense to me. Having come back recently from the developing world - a close analogue to the underclass in SR4 - I can say that the only currency used is hard, dirty cash. I realize that SR4 has the certified credstick, but even that, so the book says, is going the way of the do do. There are passkeys, hard drugs, BTL chips...
What is in your brown bags / locked briefcases / spare tires?
Does your SR universe have hard currency still in wide circulation amongst the underclass?
Like hell it is going to die out. However, Hard Cash in SR is more complicated than the ubiquous dollars of today.
First, there is the dollar. While worth not much, it is effectively the money of the underclass and for any street fare in SR - because all this fad of everyone being all about wireless money transfer in a world where the best possible encryption is worth shit boggles my mind a little too much. Dollars, like other paper money, can be had at banks, though it's more amatter of ordering them and receiving them there, and not all banks will issue dollars. Dollars are counterfeited in an alarmingly large number of cases.
For more upscale business, the Nuyen is used, though (dollars will simply not be accepted there), preferredly as digital money.
Also, there are corp scrip (paper money issued by corps, which is only good within the corp, but technically equates to the nuyen), and other currencies - Irish and Britsh pound, Euro, Rubles, Rand. Also, some governments print out Nuyen notes with ZOGB permission, which are quite highly priced among the more shady and less fortunate of society.
I don't agree that today's developing world can be equated so generally to SR4'S SINless. China is closest to how I handle this, sans the limits on citydwelling; most SINless get by as manual labor in sweat shops or construction (drones are more expensive to maintain with the crap wages these people demand, and because my SR is not supposed to be I,Robot), or Brazil with it's gangs that duke it out with grenade launchers. India too, especially for the Crazies and the havoc they cause every once in a while. Africa though, no. While my SR is a world gone bad in large parts, it is not post-apoc.
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If making a fake SIN were profitable or easy, there'd be no reason for 'runners to worry about SINs, nor to even really shadowrun as such.
Even a rating 6 fake SIN is worth shit under current rules. SINner is not a flaw in SR4, it'S close to mandatory if you do not want to play Zappin Inna Barrens type campaigns.
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i could have sworn that physical nuyen was mentioned in some earlier book, complete with a artist rendering of coin and paper versions.
Neo-Anarchist's, Sprawl Survival Guide, Tir Taingire, London books, among others. Of course, this could all be handwaived by a typical SR4 explanation along the lines of "after the crash, people distrusted physical currency because OMG WIFI IS SO LEET!!!!!"
After all, after the Matrix crashed on them, causing all kinds of bad things to happen, most people chose to openly embrace a much, much less secure and dependable second version of the Matrix with open arms.