One person calls a sum trivial; another cannot imagine paying it. A price in fiction can organise a scene even when you do not know its exact modern equivalent.
Read the number together with the reactions surrounding it. Who states the price? Who is allowed to negotiate? Does anyone explain what else the same money would buy? The story may provide a comparison more useful to the scene than a conversion into today’s currency.
In an invented example, a guest offers to replace a broken cup. The host replies that it cost “almost nothing” but then locks the remaining cups away. The financial claim and the action pull in different directions. The reader might consider sentiment, embarrassment or a refusal to accept the guest’s money; none is settled by the price alone.
Make a small ledger for the passage: amount named, speaker, immediate response and consequence. Keep it short enough to show the exchange at a glance. If the object returns later, add what has changed in its use or ownership.
Historical purchasing power requires separate research. Avoid attaching an unsupported modern value simply to make your interpretation sound precise. You can instead say that the novel presents the amount as affordable to one person and burdensome to another.
The interesting question then becomes how the conversation distributes dignity and control. A few coins or a casual offer may let you see an imbalance that the characters would never describe openly.
The accompanying visual is an editorial illustration.
