Inflation in Novels

Probably most authors are basing the currency systems on those in games, where computer games generally take the inflation that started in Table-top RPGs & ran with it.

Of course there is also the fact that it is very rare for an author to mention how much gold, silver, or whatever (or what purity) there is to a unit of currency (if a "gold piece" 1 troy ounce it is, in real-world terms, rather more valuable than a "gold piece" that weighs 1/10th of a troy ounce). 

probably something similar to idle games they need the amount to be small so that when the mc is rich he still needs to work hard for more so plot convenience 

Gold > paper, I suppose that is the logic they are going with in novels 

Since a lot of gold coins in these fantasy novels can be diluted down to lower and lower amounts of gold. As years pass they might not even have a fraction of the actual gold amount.

There could also be a million other problems like monsters spawning and dropping gold. It’s fantasy which makes it defy common sense. 

It's rare to see a novel where gold > paper. In majority novels gold is just pocket money based on buying power of gold coin. 

To begin with I'm not even sure the authors have some knowledge about economy, and also "fantasy novel"  don't even bother, u will not find any sense in there 

really? isn't a lot of them go with copper/silver/gold/platinum? so gold should worth a lot if 1s=100c. 

A hundred years ago a dollar bought way more gold than now (1000 dollars of gold now cost 20 dollares in 1915) so if youtake gold as a standart the dollar now has weaker purchishing power than 100 years ago, so we are the one with the inflation problem, the fantasy world have always used a gold coin can feed a family for a month since the begining of time

https://www.macrotrends.net/1333/historical-gold-prices-100-year-chart