Which things determine the price of a bitcoin? Why does it increase?
Randolph The price of a bitcoin is determined by supply and demand. When demand for bitcoins increases, the price increases, and when demand falls, the price falls. There is only a limited number of bitcoins in circulation and new bitcoins are created at a predictable and decreasing rate, which means that demand must follow this level of inflation to keep the price stable. Because Bitcoin is still a relatively small market compared to what it could be, it doesn't take significant amounts of money to move the market price up or down, and thus the price of a bitcoin is still very volatile.
Bitcoin price over time:
Exchanger24 gives you the option of either using your bank account to fund trading or cut straight to funding your account bitcoin to paypal
The safest option, as always, is to have a Bitcoin Wallet. You can find many options in this. There are desktop, laptop, and mobile wallets.