As Sunday is holiday in many countries, it becomes difficult to communicate with other countries for business purposes on Sunday as the offices remain closed. And alternatively, as Friday is a holiday in Bangladesh, other countries can not communicate with us on that day of the week. I believe this is a loss of millions of dollars. I feel Sunday should be an optional holiday for such businesses who would rather work on Friday than Sunday. Schools and other businesses can still remain closed on Fridays and Saturdays. I believe this will also reduce traffic jam.