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 tr

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?