What currency is used in Interactive Brokers?

I opened an account with Interactive Brokers with the intention of buying shares of American companies. In order to fund the deposit, I have a choice of currency (PLN, EUR, USD,..) - which one would be most beneficial to choose?

I opened an account with Interactive Brokers with the intention of buying shares of American companies. In order to fund the deposit, I have a choice of currency (PLN, EUR, USD,..) - which one would be most beneficial to choose?

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