The marxian labor-time values of individual commodities fall as productivity improves. This means that if a currency unit is to command a stable quantity of use-values (i.e. physical goods and services) over time, the value of the currency must likewise fall as productivity improves. For a given distribution between wage and profit income, and a given share of value added in total value, a currency unit’s command over use-values will remain stable when money wages rise in line with average productivity. This also promotes price stability.