WHY has Bitcoin risen to fast at the end of 2013 and WHY is there again this rapid trend?
I know, it's a matter of supply and demand BUT I am looking for reasons like important incidents that show a trend (like the closing of Silk Road or the announcement of Ebay/Paypal that they are interested in BTC).
Like others have said I think it just is down to supply and demand, but any bit of bad news causes idiots to panic sell and people snap up coins on this.