Needs VS Demands

Theory of economic classes "Needs VS Demands".
When income increase, demands increases as well.
And it is said that demands is always not enough.
We will demand more and more as to compare with needs.
Needs is something that a human must have in order to survive.
I realise this is quite and very true.
I realise that demands is something that will never end.
As i thought i have finished shop for all the things i need, is actually not a full stop yet.
Yesterday when i have a short conversation with Aiyak, i realise that i missed 1 good opportunity to purchase a LCD monitor.
During the PC fair, i went to low yat and accidently i bump into this Samsung 22" LCD priced at RM550+.
I am not certain bout the market price and i just shopped for a new hand phone.
Thus, i just let it go.
Then around Friday i went to mines for a walk with my GF.
And i found out that Samsung 22" priced at RM929.
I feel a bit curious and i brought up this topic with Aiyak (My IT advisor).
And he said "YA!now the LCD quite cheap lor. What you saw that day is possible."
I straight stunned a while and slightly regret i didn't purchase during that time.
RM930-RM550 = RM390 difference leh.
Plus Aiyak said the CRT monitor (the old one we are using) is not so good for our eyes.
Because of the reflection.
In the other hand LCD is better for our pair of eyes.
Thus it makes me feel that i need to buy a LCD monitor for my own health.
If i buy a LCD monitor, i need to buy a new PC table as well to fit in the LCD monitor.
Thus i will need to spend more on all this "demand" things.
Just realize that the demands here really never end.
We will keep on ask for more and more things will appear in our wishlist both directly and indirectly.
Expenditure definately will go up despite of econ crisis or econ stable.
*Crying in tears for wallet pain*