One of the more useful features in Microsoft Excel is Insert Charts. You can create a wide variety of charts: bar, line, pie and others. While many charts only involve one variable, you can create ...

Learn what flow and stock variables mean in simple terms. Understand how income, wealth, GDP, and debt connect through time and why this matters in economics and everyday life.

Investopedia contributors come from a range of backgrounds, and over 25 years there have been thousands of expert writers and editors who have contributed. Covariance indicates the relationship ...