Difference in the price of a dollar

Q 5: Shop owners define prices of commodities changeable from time to time here in Yemen. This is because the dollar rises in the morning and falls by the evening. Are such sellers sinful?

A: Fluctuation of the dollar exchange rate from time to time based on currency market fluctuation is unobjectionable. May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.