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It is desirable to develop your programs incrementally.Code a little,test a little.If you do this with virtual functions,you get into trouble.Discuss the problem and the (very simple)solution.
Marginal Revenue
The additional income gained from selling one more unit of a product.
Marginal Cost
The cost added by producing one additional unit of a product or service, which is crucial for decision-making in production and pricing.
Fixed Costs
Expenses that do not change in proportion to the activity of a business, such as rent, salaries, and insurance.
Average Revenue
Total revenue divided by the number of units sold, indicating the average income per unit of output.
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