Follow up to inflation question on further thinking: it seems especially strange if there are no periods of crisis level inflation on a third century Rome level given the rudimentary knowledge, lack of financial governing (esp. between kingdoms pre-conquest) and the need to outbid rivals for swords given the very regular inter- and intra-kingdom violence. I admit to being no financial expert but that seems like a nice mixture for devaluation and inflation. Thanks.
As people have pointed out, GRRM is not super-consistent on this stuff. For example, in a time of plenty, Dunk sells his horse for 2.3 dragons; in the midst of bloody civil war, with people increasingly unwilling to take coin (which you can’t eat) for horses (which you can), Brienne buys two horses for 1.5 dragons each.
On the other hand, at times, GRRM is better at depicting the impact of the War of Five Kings on prices. For example, when Tyrion arrives in King’s Landing just as the Tyrells have cut off the city from the south (a major supply shock) and the city has become swollen with refugees (a major increase in demand), we see hyper-inflation in action:
“The markets were crowded with ragged men selling their household goods for any price they could get … and conspicuously empty of farmers selling food. What little produce he did see was three times as costly as it had been a year ago. One peddler was hawking rats roasted on a skewer. “Fresh rats,” he cried loudly, “fresh rats.” Doubtless fresh rats were to be preferred to old stale rotten rats. The frightening thing was, the rats looked more appetizing than most of what the butchers were selling. On the Street of Flour, Tyrion saw guards at every other shop door. When times grew lean, even bakers found sellswords cheaper than bread, he reflected.”(Tyrion I, ACOK)
“Muddy Way was crowded, but soldiers and townfolk alike made way for the Imp and his escort. Hollow-eyed children swarmed underfoot, some looking up in silent appeal whilst others begged noisily. Tyrion pulled a big fistful of coppers from his purse and tossed them in the air, and the children went running for them, shoving and shouting. The lucky ones might be able to buy a heel of stale bread tonight. He had never seen markets so crowded, and for all the food the Tyrells were bringing in, prices remained shockingly high. Six coppers for a melon, a silver stag for a bushel of corn, a dragon for a side of beef or six skinny piglets. Yet there seemed no lack of buyers. Gaunt men and haggard women crowded around every wagon and stall, while others even more ragged looked on sullenly from the mouths of alleys.“ (Tyrion IV, ASOS)
So there you go.
In terms of devaluation, you have the example of the Gardener coins that Olenna uses to cheat merchants with, which are small and thin compared to post-Conquest dragons.