Prices (D20)
This page summarises various prices for the DND/PF setting.
Contents
Gold
One gold piece is 1/50 pound (0.009071847 kg / 9.071847 g).
For simplicity, we just count all change below gold as fractions of gold, and then keep track of platinum. For those that keep proper track: kudos.
I once read (but don't remember the source) that the price of a "mug" (glass, can) of beer (ale, mead) has stayed relatively stable throughout history. Using this information, and the knowledge that a mug of ale is listed as costing 1 sp, this places the purchasing power of a single gold piece at around $60. You can use this information to determine how much gold should be impressive.
It's worth noting that d20 modern used a conversion of rate of 1 gp to $20.
https://www.reddit.com/r/DnD/comments/2m38sx/how_much_would_you_define_as_a_lot_of_gold/
 An unskilled laborer makes 2sp/day, or 1.4gp per week, and has to spend all of it to maintain a Poor lifestyle. A mere 50gp (the price of a single healing potion) is the equivalent of an entire year's pay at "minimum wage".
 A skilled laborer, such as a village blacksmith or paid guard, makes 1gp per day, or 7gp a week. To this man, 50gp is nearly two month's wages, nothing to sneeze at certainly, and 360gp is full year's pay  just enough to keep him in a modest lifestyle.
 For 730gp, a character can live comfortably, if not extravagantly, for one solid year without having to work at all.
 For 1,460gp, a character can not only be comfortable all year long, but enjoy some of the minor luxuries of wealth, such as a handmaid or butler, and finer clothing
 The sum of 3,650gp will buy you a year of fantasy  servants at your beck and call, luxurious accommodations, the finest fashions, and marvelous feasts are all yours with no further work required on your part.
Buildings
Seems there's been some changes in the housing market since 3.5 (From Dungeon Master Guide 3.5)
 Simple house 1,000 gp
 Grand house 5,000 gp
 Mansion 100,000 gp
 Tower 50,000 gp
 Keep 150,000 gp
 Castle 500,000 gp
 Huge castle 1,000,000 gp
 Moat with bridge 50,000 gp
Settlements
Purchase limit, base level, etc.
http://paizo.com/pathfinderRPG/prd/gameMasteryGuide/settlements.html
Clothes
Official:
 Commonerish  =< 10gp
 Doctor's  150gp (circumstance bonus to disease)
 Noble's  75gp (needs 100gp ring + 50gp jewelery)
 Dancer's garb  100gp (+2 dance)
 Dancer's garb silver  200gp
 Royal's  200gp
 Outfit, Sun Sensitivity  300gp
 Cape, Billow  100gp (parachute)
 Wig  5500gp
 Cloak, Reversible  2s  100gp
 Vest  1 sp to 50 gp
Makes sense to have:
 Courtroom dress  100gp  300gp
 Ballroom attire  200gp  600gp
 Ballroom dress  250gp  1000gp
Mass trade
http://taodnd.blogspot.se/2010/07/letstryitfrombeginningagain.html
Services
Crafting
Takes 1 day per 1,000 gp.
Trade Goods
 These are not vetted but from the Pathfinder page.
1 cp  Guinea pig, rat, wheat (1 lb.) 
2 cp  Beans (1 lb.), cheese (1 lb.), chicken, flour (1 lb.), potatoes (1 lb.), turnips (1 lb.) 
3 cp  Charcoal (20 lbs.), citrus (1 lb.), nuts (1 lb.), peat (20 lbs.) 
5 cp  Coffee beans (1 lb.), coal (20 lbs.), masonry stone (1 lb.), sugar (1 lb.) 
1 sp  Iron (1 lb.) 
5 sp  Copper (1 lb.), garlic (1 lb.), mint (1 lb.), mustard (1 lb.), oregano (1 lb.), thin leather (1 sq. yard), tobacco (1 lb.) 
1 gp  Allspice (1 lb.), basil (1 lb.), cinnamon (1 lb.), cloves (1 lb.), dill (1 lb.), glass (1 lb.), goat, honey (1 lb.), maple syrup (1 lb.), nutmeg (1 lb.), rosemary (1 lb.) 
2 gp  Beaver pelt, chilies (1 lb.), cardamom (1 lb.), cumin (1 lb.), fennel (1 lb.), ginger (1 lb.), pepper (1 lb.), saffron (1 lb.), sheep, vanilla (1 lb.) 
3 gp  Fox pelt, mink pelt, pig, thick leather (1 sq. yard) 
4 gp  Ermine pelt, linen (1 sq. yard) 
5 gp  Marble (1 lb.), salt (1 lb.), seal pelt, silver (1 lb.) 
6 gp  Wool (1 lb. or 1 sq. yard) 
8 gp  Cotton (1 lb. or 1 sq. yard) 
10 gp  Chocolate (1 lb.), cow, darkwood (1 lb.), silk (1 sq. yard) 
15 gp  Cloves (1 lb.), ox, saffron (1 lb.) 
50 gp  Cold iron (1 lb.), gold (1 lb.) 
300 gp  Adamantine (1 lb.) 
500 gp  Mithral (1 lb.), platinum (1 lb.) 
 These are at least party modified.
1 cp  Guinea pig, rat, wheat (1 lb.) 
2 cp  Beans (1 lb.), cheese (1 lb.), chicken, flour (1 lb.), potatoes (1 lb.), turnips (1 lb.) 
3 cp  Charcoal (20 lbs.), citrus (1 lb.), nuts (1 lb.), peat (20 lbs.) 
5 cp  Coffee beans (1 lb.), coal (20 lbs.), masonry stone (1 lb.), sugar (1 lb.) 
1 sp  Iron (1 lb.) 
5 sp  Copper (1 lb.), garlic (1 lb.), mint (1 lb.), mustard (1 lb.), oregano (1 lb.), thin leather (1 sq. yard), tobacco (1 lb.) 
1 gp  Allspice (1 lb.), basil (1 lb.), cinnamon (1 lb.), cloves (1 lb.), dill (1 lb.), glass (1 lb.), goat, honey (1 lb.), maple syrup (1 lb.), nutmeg (1 lb.), rosemary (1 lb.) 
2 gp  Beaver pelt, chilies (1 lb.), cardamom (1 lb.), cumin (1 lb.), fennel (1 lb.), ginger (1 lb.), pepper (1 lb.), saffron (1 lb.), sheep, vanilla (1 lb.) 
3 gp  Fox pelt, mink pelt, pig, thick leather (1 sq. yard) 
4 gp  Ermine pelt, linen (1 sq. yard) 
5 gp  Marble (1 lb.), seal pelt, silver (1 lb.) 
6 gp  Wool (1 lb. or 1 sq. yard) 
8 gp  Cotton (1 lb. or 1 sq. yard) 
10 gp  Chocolate (1 lb.), cow, darkwood (1 lb.), silk (1 sq. yard) 
15 gp  Cloves (1 lb.), ox, saffron (1 lb.) 
50 gp  Cold iron (1 lb.), gold (1 lb.), salt (1 lb.) 
100 gp  Brandywine bottle (0.5 lb.) 
200 gp  Aqua vitae bottle (0.5 lb.) 
300 gp  Adamantine (1 lb.) 
500 gp  Mithral (1 lb.), platinum (1 lb.) 
Magic
 Scrolls  Slvl x Clvl x 25 (x2)
Useful links
 Goods and Services
 Hirelings, servants & services
 Goods and Services
 http://www.d20pfsrd.com/equipmentfinal/goodsandservices/uemoregear4
 http://paizo.com/pathfinderRPG/prd/ultimateEquipment/gear/entertainmentAndTradeGoods.html
 http://paizo.com/pathfinderRPG/prd/ultimateEquipment/gear/lodgingAndServices.html
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