There are a lot of factors influencing the price of bitcoin, including technical issues/new alts coming out/regulations/stubborn miners/conflicts between developers(or groups)...etc.
What do you think is the most crucial cause? Why did the price drop dramatically these days? Will this be a rebound point?
I think the supply and demand of bitcoin has the greatest impact on the price of bitcoin. The bad news about bitcoin is that it will sell bitcoins in order to cause panic, so that the supply of bitcoins will outpace demand, which will lead to the price of bitcoins falling.