Apple worth half a trillion dollars

It is amazing that Apple is now worth over 500 billion dollars or half a trillion dollars. This is the companies market value and yesterday their market cap reached over 500 billion dollars. There has only been 4 other companies that have ever done reached over that half trillion line. Microsoft, ExxonMobil, Cisco, and General Electric are the only other companies that have done this. The company had 127 billion dollars in sales last year which is higher than Qatar's GDP. I find it amazing how a company that was started in a garage can grow to be worth that much in just 30 years. The stock price is over 500 a share, which is pretty crazy because it is more expensive to by 1 share of stock than it is buy a brand new iPad. Do you think they will sustain thier growth further? or do you think they will slip back down like the other 4 companies that reached that half trillion market cap?