The margin sensitivity index is a measure of how much a company’s profit margin is affected by changes in its sales or revenue. It is calculated by dividing the percentage change in profit margin by the percentage change in sales. A higher margin sensitivity index indicates that a company’s profit margin is more sensitive to changes in sales, while a lower index suggests that the profit margin is less affected by fluctuations in sales. This index is often used by investors and analysts to assess a company’s financial stability and its ability to withstand market volatility.