Stock Market in the First Place

The stock market has always been a strange thing to me. I mean, the value of the stock of a company has only minimal relation to the actual value of a company. I mean, a stock can go up twice, three times, even six times its value in a day. You can't tell me that company is actual worth six times its value in a day. It sure as hell hasn't made six times as much stuff.
So, you've got this system in which an abstract relationship to money begets more money. In other words, abstract projections on monetary change begets real money which begets real change.
Companies have to base their corporate planning on how to maintain or increase their stock valuation in a quaterly basis. So, the amount that other people will decide that they are worth in play money somehow translates to what they actually are worth. Companies can go backrupt selling the same amount of product that they were selling yesterday if their stock plummets.
What?
That just doesn't make any sense to me.
And the fact that companies have to worry about their short term bottom-line more than their long-term one in order to maintain their stock values is one of the stupidest business models I could possibly imagine.
How could a model that says you should only think about were you will be in three months and ignore where you will be in three years possibly be considered even functional?
This is not some guy, just out of college, not wanting to think any further than the next three months. That's fine.
This is a company which makes something, brings in and expends millions of dollars, and has lots of people working there. It's the business model of a four-year-old.
All for the dictates of a speculative game. Which is all the stock market is. A fucking game. Not based on what a company does, how "good" or "bad" they are, either morally, socially, or economically, but based simply on how much other people want to buy and trade invisible insignificant amounts of ownership of a company, but don't want to have any involvement with the company itself.
Does a stock broker buy Boeing because he has ideas on how they should build new airplanes?
No wonder the stock market is falling apart.
It shouldn't have stayed together this long in the first place.
Time for a new economic model, for fuck's sake!