The safest way to make money with trading is through arbitrage. This means that you see an opportunity to buy an asset in one place for a certain price and sell it immediately at another place for a higher price. It is important that you know you can sell the asset immediately at a certain price. If you decide to keep that asset and sell it later after price will shift - then it is speculation not arbitrage anymore.
I disagree. It may be true in some cases and currency, especially in the FOREX market, but it's not true with bitcoin. Unless you have really huuuuuuuge amounts in many brokers.
Cause you can't transfer funds from an exchange to another, it takes too much time! Depending on number of confirmations needed it can take up to an hour to make the transfer! So hard to do any arbitrage...
And you have to see a gap of prices big enough to absorb the fees, you usually have a 0.2% fee that woud'll have to pay twice. Considering the current price of 450$ (more or less) it means you have to ensure at least a 2$ difference ONLY TO BE EVEN!
Arbitrage is for huge amounts, dealt by robots in an automatic and fast way.
At least that's my opinion