BTC = USD - it is the same, please 
Why do you think it is the same, same on what.
Bitcoin is a digital (virtual) currency and dollar is physical and digital currency too.
Also bitcoin is a platform itself, it is all open, and all transaction are visible to the public.
That was a troll posr I guess.
Of course BTC is not equal to USD. If you have any doubt about this statement please take a look http://preev.com/
It is obviously more than USD x 300. So they are not equal. )
Because the bitcoin coins are limited to 21 Million.
It never will be the same with dollar in this aspect.
But also not even similar in the way that these two works because are totally different.