The rate of change (ROC) is the speed at which a measurement changes over a period. Learn why the rate of change matters in investing and finance.

A graph highlighting the monthly change in CPI shows a steady decline in inflation, however the figures are not seasonally adjusted to exclude volatile items.

The rate of reaction can be analysed by plotting a graph of mass or volume of product formed against time. The graph shows this for two reactions. The steeper the line, the greater the rate of ...