Who decides that on which day of the week the market has to remain closed?

The decision on which day of the week the market remains closed is typically made by regulatory authorities or governing bodies in each country. This can include stock exchanges, financial regulatory agencies, or government entities, which consider factors such as tradition, local customs, and the need for a break in trading activities. In many countries, markets are closed on weekends, while some may also observe public holidays. Ultimately, these decisions aim to balance market efficiency with the needs of investors and participants.