How to Invest in Bitcoin

For Americans with Coinbase there is an option to link your bank account to your wallet making future payment transfers easier but i've to note that Coinbase is not a bitcoin exchange, you are buying/selling your coins directly from the firm. For traders that want a traditional bitcoin exchange, BitStamp is another option. With BitStamp, you are trading with other users and not the company, which only acts as a middleman. Liquidity is higher and you can almost always find another person to take the other side of your trade. 

Personally,if you are European, i recommend a small french exchange, paymium that is using as a bank partner BNP Paribas.
Other exchanges not particularly recommended by me but still used by the bitcoin community, probably because of high liquidity, are:

• https://www.bitfinex.net/ Bitfinex – invest in the future, The platform is owned and operated by iFinex Inc., which is registered on the British Virgin Islands (BVI)
  
• https://www.bitstamp.net/ Bitstamp – buy and sell bitcoins, located in Slovenia
  
• https://www.btcchina.com/  BTCchina, located in Shanghai, Cina
  
• https://btc-e.com/ BTC-e, i failed to discover physical address for this exchange. Their banking partner seems to be “Mayzus Financial Services Limited“
  

For large btc investment you can now use BIT, The Bitcoin Investment Trust, now listed at OTCC market, open-ended trust that is invested exclusively in bitcoin and derives its value solely from the price of bitcoin. It enables investors to gain exposure to the price movement of bitcoin without the challenges of buying, storing, and safekeeping bitcoins.