i noticed tis little sth when i interacted wif my P3 tutee...

when he doesn't wan to do his work,
i would go :"are u sure? if u do it, i will get u a yoyo as b'dae present oh!"

yes, jus like wad u guessed,
this cutie boy took up his pencil and started to do his work upon hearing this.

the next thing tat will come to ur mind will be :"wah, so cheapo. jus a present to make mi do my work?! ya, maybe try a psp."

after giving this phenomenon some thought，
i realised how humans get greedier as they age.
at 5, a sweet.
at 10, a toy.
at 15, a computer.
at 20, a car.
too greedy. when will one ever be truly satisfied?

conclusion:

做人要知足。因为这是快乐的根源。
金钱不能提高幸福指数，
只是个满足你虚荣之心的实在物。