<prompt> Human: Hi! So, I am an American citizen livingworking abroad in Europe. I have an American and a European bank account. There is a ever so slight interest rate gain in my American account, and there is an ever so slight negative interest rate in my European account. My line of credit is in the US, I have a great credit rating, and get points for airlines or cash equivalent through my bank CapitalOne. Ive been living here for 8 months now, and I dont foresee leaving in the next two years, and there is a chance I will stay for much longer. I do have around 50k currently invested in US stock market through a fiduciary. For the last 8 months I have been transferring money from my Dutch bank account to my American one because I get points spending on my US credit card I have 0 fees charged spending the card on Euro transactions - worked that out on purpose, and when the time comes to give more money to my fiduciary it is easy to transfer. My question is, should I keep doing this? Maybe at one point I will want to buy a house here, or maybe I will wait until I move back to America a lot is up in the air. I need some advice. I dont like the negative interest rates in the dutch accounts, and I cannot build points in that account as I can through CapitalOne credit. However, maybe at some point I will need large sums in Euros to buy a house, horse Im a competitive rider, have a child - who knows. Anyone here with some advice? greatly appreciated! EDIT: work pays for my transfer fees so no need to account for this.Assistant: You probably want to keep the money in the currency you plan to spend; otherwise, you are a currency speculator. The dollar went up by 25 vs. the Euro in recent years, so thats an example of how your purchasing power can change. What if you keep your money in dollars and it goes back down?Human: the thing is I spend in both. Rent, groceries, small purcahses, riding lessons, are all in Euros. Anything larger than 200 I always do on my credit card so I get the airlines miles. Plus I invest my US account. So its a stale mate in that way?  <response>: The way you spend e.g. credit card doesnt determine the currency you spend. If you are using your credit card to make purchases in euros, then you are spending euros, even if you are billed in dollars and run an arbitrage risk between the expense and the payment. 