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3% in the UK on GBP is different from 3% in the US on USD. You can't really compare them.

3% is 3%. 3% on £100 = £3. 3% on $100 = $3.

If both banks invest in whatevs (local currency) paying 5%, then they get 5%, pay you 3% and make 2%.

Are you trying to reference relative inflation?

Or something about the USD makes it difficult to invest?