After a month, serum total PSA value was 1.2 ng/ml. In another blood test after 3 months, serum total PSA value rose to 7 ng/ml with a percent free PSA of 40%. The urologist recommended a transrectal ultrasound-guided prostate biopsy. The patient refused biopsy.
Of the four components of aggregate demand, consumption expenditure C is the largest contributing to between 60% and 70% of total expenditure. For this reason, we often start our analysis with this particular component.
Contribution margin (CM), or dollar contribution per unit, is the selling price per unit minus the variable cost per unit. âContributionâ represents the portion of sales revenue that is not consumed by variable costs and so contributes to the coverage of fixed costs. This concept is one of the key building blocks of break-even analysis. Decomposing Sales as Contribution plus Variable Costs.