Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

Why is the stock market closed on the weekend?
After-hours trading and alternate venues allow one to trade outside of regular market hours. However there are a few reasons why you would not want to: The purpose of an exchange is to improve liquidity by gathering all buyers and sellers in the same place at the same time. If trading was 24/7, not all market participants would be trading at the same time. Some markets (including NASDAQ) depend on market makers or specialists to help liquidity. These exchanges are able to mandate that the market maker actively make a market in a security during a meaningful percentage of the trading day. Requiring 24/7 active market making may not be reasonable. Trading systems, meaning both exchange infrastructure and market participant infrastructure, need maintenance time. It's nice to have the evenings and weekends for scheduled work. Post-trade clearing and settlement procedures are still somewhat manual at times. You need staff around to handle these processes.