Marginal Utility

An example for diminishing marginal utility..

Reading~

The first book which I have read is so interesting, I get interested and I like it so much..I get 100 points of utility..(for an example)
The second book which I have read is interesting too, I like it..I get 70 points of utility..
The third book is interesting too..I get 30 points of utility..
The fourth book is abit boring..I lesser like it..I get 0 point of utility..
The fifth book is damn boring!I hate it!!!I get -15 points of utility..

In this way, you may learn what is diminishing marginal utility..
And the fifth book taught you about what is a negative marginal utility.. =)

Learnt the "marginal utility" in Taylor's College
while the example is from the author..