In economics, marginal means

• A. Additional
• B. Extra
• C. One more
• D. All of the above

Answer: (D)

Verified step by step guidance

1. Understand the term 'marginal' in economics: It refers to the change in a variable when an additional unit is added. This concept is crucial in decision-making processes, such as determining the optimal level of production or consumption.
2. Recognize that 'marginal' can be applied to various economic concepts, such as marginal cost, marginal revenue, and marginal utility. Each of these represents the additional cost, revenue, or utility gained from producing or consuming one more unit.
3. Consider the context in which 'marginal' is used. For example, marginal cost is the cost of producing one more unit of a good, while marginal utility is the additional satisfaction gained from consuming one more unit of a good.
4. Evaluate the options given in the problem: 'Additional', 'Extra', and 'One more'. Each of these terms aligns with the definition of 'marginal' as they all imply an incremental change.
5. Conclude that the correct answer is 'All of the above', as each option accurately describes the concept of 'marginal' in economics.