Stock Markets: What if they are open on the weekends

Just a thought.

What if the stock markets remain open through the weekends? Okay, okay... maybe not Sunday as well... but seriously, what if a stock exchange said, we are open and trading on Saturday?

I think there will be a lot of "individual investors" who would be willing to invest in stocks, research, etc. And they can come back to work on Monday for their regular jobs.

Thoughts? (By the way: Post Offices are open on Saturday, so are Banks, public transportation systems, and your local grocery stores. Why not the stock markets?)