I also wondered why the bitcoin and cryptocurrency price is different and higher at each exchange. I did some research and found out that
There is no single international price.
Prices vary significantly between exchanges in different countries.
Exchange does this to manage buy and sell demand.
For example:
If the exchange doesn't have enough sellers, they keep increasing the sell price till they have sellers. And they keep the buy prices very high to discourage buyers. If they don’t do this, they will have no stock left to sell.
Please share your views on cryptocurrency price is higher or different at each exchange in comments.