The real purchasing power of one US dollar from January 2000, eroding in real time.
Data: Bureau of Labor Statistics CPI-U, All Items, US City Average, Not Seasonally Adjusted. Series CUUR0000SA0.
The displayed value is interpolated from the long-term CPI trend since January 2000, extended to the present moment at the average rate of change. The real-time tick subdivides that rate into per-second increments.