Thursday  June 21, 2018
 AmosWEB means Economics with a Touch of Whimsy!
 BANK RESERVES: The "money" that banks use to conduct day-to-day business, including cashing checks, satisfying customers's withdrawals, and clearing checks between accounts at different banks. The "money" in question includes vault cash and Federal Reserve deposits. Specifically, vault cash is the paper money and coins that a bank keeps on the bank premises (both in the vault and in teller drawers), which is used to "cash" checks and otherwise provide the funds that customers withdraw. Federal Reserve deposits are accounts that banks keep with the Federal Reserve System, which are used to process, in a systematic, centralized fashion, the millions of checks written each day by customers of one bank that are deposited by customers of another bank. Using these deposits, the Fed acts as a central clearing house for checks, being able to simultaneously debit the account of one bank and credit the account of another. More on the importance of bank reserves can be found under fractional-reserve banking.

POINT ELASTICITY:

The relative responsiveness of a change in one variable (call it B) to an infinitesimally small change in another variable (call it A). The notion of point elasticity typically comes into play when discussing the elasticity at a specific point on a curve.
Point elasticity can be calculated in a number of different ways. Sophisticated economists, using sophisticated mathematical techniques (better known as calculus) calculate point elasticity by using derivatives. Derivatives are calculus talk for infinitesimally small changes. The formula for calculating point elasticity using calculus is given as:

 pointelasticity = ∂BB ÷ ∂AA
The symbol that looks like a backward six (∂) is the mathematical notation for a derivative, or infinitesimally small change. The first term on the right-hand side of this formula is the percentage change in variable B and the second term is the percentage change in variable A.

Unsophisticated folks can also calculate point elasticity without the use of sophisticated calculus. This is done with the midpoint elasticity formula, presented here:

 midpointelasticity = (B2 - B1)(B2 + B1)/2 ÷ (A2 - A1)(A2 + A1)/2
The first term on the right-hand side of the equation is the percentage change in variable B. The second term is the percentage change in variable A. The individual items are interpreted as this: A1 is the initial value of A before any changes, A2 is the ending value after A changes, B1 is the initial value of B before any changes, and B2 is the ending value after B changes.

This midpoint elasticity formula actually calculates the average or arc elasticity of the entire line segment. However, it also calculates the point elasticity for the midpoint of a line segment.

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Recommended Citation:

POINT ELASTICITY, AmosWEB Encyclonomic WEB*pedia, http://www.AmosWEB.com, AmosWEB LLC, 2000-2018. [Accessed: June 21, 2018].

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