20110929 follow me 143 by 思念江南

写的很不错。。。。。

at the beginning  of a new product , every aspect is unique .  the producer benefits much .this is nearly to  monopoly.  slowly there are more producers and more similar products . ipad market is an example. so when you want to buy a product you had better wait for a time then the price maybe lower .

it's result of market competition .Amazon cutting prices can increase his sale quantity, it is good to consumers.