“Inflation is always and everywhere a monetary phenomenon.” Milton Friedman, the most important and second most influential economist of the last century, died last week. You can see the fundamental truth of his work every day in some of the oldest and most popular online games.
Most online games print currency the way that third-world kleptocracies do: whenever it is convenient and in demand, with little thought for long-run consequences. This works in the extreme short run and leads quickly to ridiculous inflation.