Statistical Process Control (SPC) Methods. Statistical process control (SPC) monitors specified quality characteristics of a product or service so as: To detect whether the process has changed in a way that will affect product quality and. To measure the current quality of products or services. Control is maintained through the use of control charts.
The underlying basis of criticism of GDP as a measure of welfare is the divergence between the critic's values and market values. The critics make an implicit assumption, or, quite possibly, a conscious presumption, that the former values are superior, if not far superior, to those of the latter.
The measure compares the actual GDP (output) of an economy and the potential GDP (efficient output). When the economy is running an output gap, either positive or negative, it is thought to be running at an inefficient rate as the economy is either overworking or underworking its resources.Economic theory suggests that positive output gap will lead to inflation as production and labor costs rise. RELATED TERMS.hen the economy is running an output gap, either positive or negative, it is thought to be running at an inefficient rate as the economy is either overworking or underworking its resources. Economic theory suggests that positive output gap will lead to inflation as production and labor costs rise. RELATED TERMS.