Investopedia contributors come from a range of backgrounds, and over 25 years there have been thousands of expert writers and editors who have contributed. Eric's career includes extensive work in ...

Learn how variable costs fluctuate with production levels and their impact on profit margins. Explore examples like raw materials and hourly labor.

Small-business owners live and die by their margins. This concept can become complicated and confusing when translated into actual numbers -- especially when it comes to profitability ratios and ...