In any country with a free exchange of currency there is no problem for investors to get any amount of currency they want. They buy it on the open market. Forex

In any country with a free exchange of currency there is no problem for investors to get any amount of currency they want. They buy it on the open market. Forex is the biggest and most liquid market in the world. Before the Euro every country in Europe had bonds in their own currency. Interest rates were higher in some due to inflation and default risk, but there was no problem borrowing large sums of money.