The document discusses three types of leverage: operating leverage, financial leverage, and total leverage. Operating leverage measures the effect of changes in sales on earnings before interest and taxes (EBIT). Financial leverage measures the effect of changes in EBIT on earnings per share (EPS). Total leverage is the combination of operating and financial leverage and measures the impact of changes in output/sales on EPS. Each type of leverage is a measure of risk to the firm from changes in sales, EBIT, or output.