CONTRIBUTION/SALES RATIO (C/S RATIO) is a tool used in profit management. It is important to establish the C/S RATIO: C/S ratio = (Sales revenue - Variable cost of sales)/Sales revenue x 100. If a company achieves a high average marginal profit ratio of say, 40%, it does not mean that it will achieve high profits. The eventual profit will be dependent on the level of fixed costs within the organization.
TIC/EBIT is one of the earnings multiples ratios used in determining company value.
CONVEXITY is the price change that occurs for a bond not accounted for or predicted by modified dU1"ation. Convexity explains why price change estimates using modified duration increase in error as the yield changes, generally by more than 100 basis points. Bonds with positive (negative) convexity have increased (decreased) duration as interest rates fall (rise). Bonds with positive convexity, such as those with put options, have returns higher than those predicted by duration alone. Mortgage-backed securities and callable bonds generally have negative convexity, which means that the price increase predicted by duration for a steep rate decline is too high.
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