October 24, 2021 

AmosWEB means Economics with a Touch of Whimsy!

AmosWEBWEB*pediaGLOSS*aramaECON*worldCLASS*portalQUIZ*tasticPED GuideXtra CrediteTutorA*PLS
PAR VALUE: The stated, or face, value of a legal claim or financial asset. For debt securities, such as corporate bonds or U. S. Treasury securities, this is amount to be repaid at the time of maturity. For equity securities, that is, corporate stocks, this is the initial value set up at the time it is issued. Par value, also called face value, is not necessarily, and often is not, equal to the current market price of the asset. A $10,000 U.S. Treasury note, for example, has a par value of $10,000, but might have a current market price of $9,950. The difference between par value and current price contributes to the yield or return on such assets. An asset is selling at a discount if the current price is less than the par value and is selling at a premium if the current price is more than the par value.

Visit the GLOSS*arama


A mathematical connection between a marginal value and the corresponding total value stating that the marginal IS the slope of the total curve. This mathematical relation between total and marginal surfaces throughout the study of economics, especially utility (total utility and marginal utility), production (total product and marginal product), cost (total cost and marginal cost), and revenue (total revenue and marginal revenue). A related mathematical relation exists between a marginal value and the corresponding average value.
The mathematical relation between total and marginal means that the slope of a total curve is the marginal value. If the total curve has a positive slope (that is, is upward sloping), then the marginal is positive. If the total curve has a negative slope (downward sloping), then the marginal is negative. If the total curve has a zero slope (horizontal), then marginal is zero. Moreover, if the total curve has an increasing slope (becoming steeper), then the marginal is rising. If the total curve has a decreasing slope (becoming flatter), then the marginal is falling.

To see the connection between a marginal and the slope of a given total, consider this general formula for calculating a marginal from a total:

marginal=change in total
change in quantity

Now consider the general forum for calculating the slope of a total curve.

=change in total
change in quantity

Is this an illusion, or are these two formulas the same? A quick check with an optometrist and psychiatrist suggests a firm grip on reality. The only possible conclusion is that these two formulas are, in fact, the same. And this means that the slope of a total is, in fact, the corresponding marginal.

To put this another way, the term "marginal" is really just another way of saying "slope." The two are really one and the same. The only conceivable difference is that slope is used when an actual graph is under discussion, whereas marginal is used when attention is turned to a mathematical equation. But, the underlying concept is the same, whether it is presented in the form of a graph or a mathematical equation--marginal is slope.

This total-marginal relation surfaces throughout the study of economics. Four of the more important total-marginal relations encountered are total utility and marginal utility, total product and marginal product, total cost and marginal cost, and total revenue and marginal revenue.


Recommended Citation:

TOTAL-MARGINAL RELATION, AmosWEB Encyclonomic WEB*pedia,, AmosWEB LLC, 2000-2021. [Accessed: October 24, 2021].

Check Out These Related Terms...

     | total product and marginal product | total product | marginal product | total utility | marginal utility | total product curve | total utility curve | average-marginal relation |

Or For A Little Background...

     | graphical analysis | marginal analysis | economic analysis |

And For Further Study...

     | opportunity cost, production possibilities | slope, production possibilities curve | production possibilities | short-run production analysis | long-run production analysis | consumer demand theory | law of diminishing marginal returns | law of diminishing marginal utility | law of increasing opportunity cost | total cost and marginal cost | total variable cost and marginal cost | slope, production possibilities curve |

Search Again?

Back to the WEB*pedia


[What's This?]

Today, you are likely to spend a great deal of time at a garage sale looking to buy either a birthday greeting card for your mother that doesn't look like a greeting card or a handcrafted spice rack. Be on the lookout for celebrities who speak directly to you through your television.
Your Complete Scope

This isn't me! What am I?

The portrait on the quarter is a more accurate likeness of George Washington than that on the dollar bill.
"Do not let what you cannot do interfere with what you can do. "

-- John Wooden, basketball coach

Social Science Research Network
A PEDestrian's Guide
Xtra Credit
Tell us what you think about AmosWEB. Like what you see? Have suggestions for improvements? Let us know. Click the User Feedback link.

User Feedback

| AmosWEB | WEB*pedia | GLOSS*arama | ECON*world | CLASS*portal | QUIZ*tastic | PED Guide | Xtra Credit | eTutor | A*PLS |
| About Us | Terms of Use | Privacy Statement |

Thanks for visiting AmosWEB
Copyright ©2000-2021 AmosWEB*LLC
Send comments or questions to: WebMaster