Item value prescaler
An optional rule that can be applied to a character that shifts the specie standard the game uses (e.g. the standard pricing is measured in silver pieces, rather than gold pieces) for games where a different standard is desired, such as historical fantasy settings.
If possible, additional prescalers to modify certain specific classifications of goods and services (a weapon group, room and board, alchemical supplies, etc.), expanding on how the existing "Common guns" optional rule works.