Margin Erosion
When the amount of profit a business earns from selling a product or service decreases due to rising costs or falling sale prices.
An example of margin erosion occurring in a fuel distribution business:
A propane distribution firm sells a future delivery of 1,000 gallons of propane to one of their customers at a price of $2/gallon. That firm desires a margin of $1/gallon and that can be achieved at current market prices. However, three months in the future propane costs increase by $.30/gallon and the distributor’s margin has dropped 30%.