Why Apple's Price keeps going up after Steve Job's departure ?

http://www.fool.com/investing/general/2012/08/24/tim-cooks-first-year-as-apple-ceo-so-far-so-good.aspx

Motley Fool : Apple was sitting on a mountain of cash & Steve Jobs didnt want to spend it contrary to even Warren Buffet's advise !

After Steve's departure, his successor, Tim Cook, distribute it via dividend and share buyback...which may account for the price increase and low volume.....

And supposedly, IPhone 5 screen is larger contrary to what Steve wanted....