One can buy traditional commodities on various exchanges during several various countries, and sometimes there could also be price differences between these exchanges. There are multiple Bitcoin exchanges, and there could also be price differences between them. Arbitrage players cash in price differences to shop for commodities in markets where there is a surplus and sell commodities in markets.  

Similar opportunities exist in Bitcoin markets. You would not expect that to be so with a digital commodity, but there are external factors where the rubber meets the road. Most obviously, different exchanges in several countries operate in several fiat currencies, so for instance, once we compare the Bitcoin price in US dollars between a Canadian-based exchange and a Hong Kong-based exchange, a part of the difference is the friction of the exchange between those various local currencies. 

These costs and troubles are the friction that makes a number of these imbalances. Suppose Indians have a buying spree, bidding up the worth of Bitcoin on their local exchanges. In that case, it is often a challenge for people selling Bitcoin in other currencies to maximize the arbitrage opportunity. However, it isn't insurmountable, and there are rewards for people that can find out the way to roll economically. Travelers who bank in multiple countries and who need multiple currencies, for instance, could be ready to save on these frictional costs. 

We can find an equivalent kind of opportunity available in Bitcoin mining. Mining with any hope of generating revenue consumes plenty of power - such a lot so that it costs most of the people quite much. However, reside during a situation where power is free and cheap (i.e., solar or wind), or where the thermal output of mining can offset your heating costs. It is going to be possible to mine profitably.