Un'industria di lusso al servizio del grande commercio:
il mercato dei drappi serici e della seta nella Firenze del Quattrocento
Sergio Tognetti
L.S. Olschki, 2002 - 218 pages
http://books.google.de/books?id=GIa2AAA ... rch_anchor
I've only an excerpt of the appendix of the work. From this view alone it seems not possible to define the terminus "opera", which plays a deciding role in the questions about the income of common people.
Overviews:



The lower classes are the social winners of the big plague 1348-1350.
The following period shows a specific Florentine crisis, starting with the war of eight saints ...
http://en.wikipedia.org/wiki/War_of_the_Eight_Saints
The best situation for the lower classes is the period 1394-1430.
In the period, when the renaissance produced a lot of wealth for the higher classes (second half of 15th century), the lower classes drop down from the rich table.
As lower classes are here assumed land workers and the helpers of the Muratori (qualified building worker). Both groups earn about 60% of the income of the qualified worker.
The list don't show, how large the part of "lower class" persons had been at specific time. It might well be, that in the specific time the part of the qualified persons has grown and the part of the unqualified persons was diminished in the 2nd half of 15th century. On the other hand the wealthy Florence under Lorenzo de Medici strands in very poor period under Savonarola, a clear sign, that social problems existed.
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Salary




Food prices
Grano



Vino



Olio



Carne


Pisces


Legumi


Wood for burning



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Well, our question should be, what you would get for the value of a cheap Trionfi deck in the 1440s and 1450s, which is about 9 - 12 Soldi. In the lists of Franco Pratesi the price is twice recorded as lower than 9 soldi:
1452-12-12 Florence - 8 Trionfi decks (8 Soldi)
Acquired by: Silk dealers Lorenzo di Bartolo / Matteo di Zanobi
From artist: Antonio di Dino
1455-04-02 Florence - 12 Trionfi decks (Piccolo 7.42 Soldi)
Acquired by: Silk dealers Lorenzo di Bartolo / Matteo di Zanobi
From artist: "uno dipintore"
For other price categories, only from sales and aquire actions of the silk dealers and the Lapini family (46 activities), I get:
about 16 deals in the category 9-12 soldi
about 16 deals in the category 14-20 soldi
about 5 in the category 25 soldi and higher (only from Manetto Agnoli)
and the rest is not clear.
(somewhere I miscounted, later I'll find the precise numbers)
The number of traded decks in the cheaper deals is higher than in the other deals. If I would include the other documents, the expensive deals would increase more than the cheaper deals, but the number of decks in the cheaper category would stay higher than the number of decks in the higher categories.