Leverage refers to assets or sources of finance that a firm uses which require fixed payments. There are three types of leverage: operating, financial, and combined. Operating leverage is caused by fixed operating expenses and measures how changes in sales impact earnings before interest and taxes. Financial leverage is caused by fixed financial costs like interest and measures how changes in earnings before interest and taxes affect earnings per share. Combined leverage multiplies the effects of operating and financial leverage and represents the total risk faced by a firm.