Investopedia explains 'After-Tax Profit Margin'
Often, a company's earnings don't tell the entire story. The amount of profit can increase, but that doesn't mean the company's profit margin is improving. For example, a company's sales could increase, but if costs also rise, that leads to a lower profit margin than what the company had when it had lower profits. This is an indication that the company needs to better control its costs.
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