What is the difference between this two kinds of calculations of elacisity???
Since Arc one calculates the average of the coefficient, wut is the advantage???? And under wut situation should i use arc or point??????

Get Serious...I was confused....

I donno whether there is true economists here or just general discussors.....I was surprised that no one so far can answer this basic theoratical economic questions....
=.=

up up...still no one answered????

try http://groups.google.com/groups?hl=en&lr=&group=sci.econ. There are lots of "semi-, professional" economists hanging out there.