Hey Peeps... So, as the indicator over there says, I am a noob... so... noob question time. The exchange rate for btc has dropped over $100 in the past week. it was up around $614. I know it fluctuates, but can you all help me understand what causes it to fluctuate? As all the IRS regulations about BTC affected it much?

Oh and screw the IRS... btw...

Thanks in advance!