1E: AD&D has a list of hirelings and their salaries.How much do regular people, from poor to rich, earn in gold, silver and copper? How much are weekly or monthly wages for non-adventurers in dnd? Does it vary from edition to edition and setting to setting?
Well, it also differed between authors. In some cases, things are tried to be kept realistic such as the 1cp/lb price for flour. Meanwhile, other authors assume only an adventurer economy and price classically inferior grains such as millet as much more expensive. Likewise, they seem to have no idea what they are talking about when making marzipan 160x the cost of the ingredients needed to make it, or the cost of fish from the local stream in the GP per pound (3E Arms and Equipment Guid, I'm looking at you). Most of the treatment D&D gets for any attempt on economy is because they occasionally try (e.g. max number of items that can be purchased in a population center) with rules to keep players from abusing things which of course breaks down in plenty of cases. Meanwhile, other games don't even try, allowing for even greater egresses. Traveller has some economy stuff as trading is a part of the game, but nobody harshes on Top Secret because there are no Investment rules (although you can always do the trick of buying counterfeit money and using that to buy equipment).In actual gold and silver probably very little, if any. MOST people trade in goods and services, particularly in the assumed pre-industrial setting wherein most people are subsistence farmers, and that is pretty much the primary locus of economic activity.
That being said, ultimately you've asked a deeper and to some extent unanswerable question, because most if not all D&D books that detail settings really do any kind of in-depth analysis of the setting economy. And I don't mean just "what kind of coin do the various realms use", but "how are goods and services produced, traded, and consumed?" And that is ultimately because the various setting and rule books assume an "adventurer-based economy".
Which is why you have things like "the ten foot pole costs more than a ten foot ladder, which is literally composed of two ten foot poles".
... but this assumes you're doing nothing to prop yourself up.Modest. A modest lifestyle keeps you out of the slums and ensures that you can maintain your equipment. You live in an older part of town, renting a room in a boarding house, inn, or temple. You don’t go hungry or thirsty, and your living conditions are clean, if simple. Ordinary people living modest lifestyles include soldiers with families, laborers, students, priests, hedge wizards, and the like.
Presumably it assumes even if you're trying to make a suit of Full Plate, you've got enough time bettween tasks to do odd jobs to cover costs.While crafting, you can maintain a modest lifestyle without having to pay 1 gp per day, or a comfortable lifestyle at half the normal cost (see chapter 5 for more information on lifestyle expenses).
Skilled 2 gp per day
Untrained 2 sp per day
Skilled hirelings include anyone hired to perform a service that involves a proficiency (including weapon, tool, or skill): a mercenary, artisan, scribe, and so on. The pay shown is a minimum; some expert hirelings require more pay. Untrained hirelings are hired for menial work that requires no particular skill and can include laborers, porters, maids, and similar workers.