[Excerpt] The Producer Price Index (PPI) measures the average change over time in selling prices received by domestic producers for their output. The main PPI measure of inflation, the Final Demand- Intermediate Demand (FD-ID) System, measures final demand inflation (price changes for goods, services, and construction sold to consumers, capital investment, government, and export buyers) and intermediate demand inflation (price changes for goods, services, and construction sold to businesses as inputs to production, excluding sales of capital investment). This issue of Beyond the Numbers describes PPI price movements in 2015.