| Definition: | Net Profit Margin measures profitability as a percentage of revenues after consideration of all revenue and expense, including interest expenses, non-operating items, and income taxes. For a business to be viable in the long term profits must be generated; making the net profit margin ratio one of the key performance indicators for any business. It is important to analyze the ratio over time. A variation in the ratio from year-to-year may be due to abnormal conditions or expenses which need to be addressed. A decline in the ratio over time may indicate a margin squeeze suggesting that productivity improvements may need to be initiated. In some cases, the costs of such improvements may lead to a further drop in the ratio or even losses before increased profitability is achieved.
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