States generally make money only through taxation, with the exception of some nationalized industries.
You won't be able to share your BIR. Of course, you will be able to give the money to someone if you want to.
I think it will always be possible to sell your BIS, even if it's not supported by the state. I can always sign a contract saying "from now on I swear I'll give all my BIR to XXXX". It's basically a eternal debt contract, but your proposal makes this idea not so ridiculous.
Why you'd do that without something worthwhile in exchange is beyond me.
"Worthwhile" is very relative. It all depends on your time preference regarding consumption.
Some people might prefer having 100 BIR right now rather than waiting 100 months. So they might accept to sell their BIS against 100 BIR.
More generally, some people might be more "carpe diem" oriented, so they'll just sell their BIS to people who think they'll live two hundred years (I'm exaggerating).
I don't see how you'd end up with people getting other people's money outside of criminal coercion, which can be defended by the courts.
Private contracts do exist. And even if courts decided not to defend them, reality would, as screwed people would get angry and would use violence.
And I guess if you want to opt out, then you should be able to, but no state support would be given then.
Ok, that's one thing. But can I be exempted from tax then?
Now, stocks and shares are quite an interesting animal. First of all, to buy them, you have to have some capital. Money makes more money. If you don't have the starting capital and your living expenses keep eating up your minimum-wage job earnings, you'll never make it to the stockmarket. And not for lack of trying.
You can buy stocks with no more than a few dollars. That's a start. Maybe the OP has spent much more in contributions to the pirate party. Which to me is ironic.
Money makes more money indeed, but your system does not change that. People could buy BIS, and with the money they get from these BIS, they'd buy even more BIS.
Second, I believe an argument can be made that relying on income from stocks is an unproductive life. You are not helping the community in an way, you are not producing something, your are not providing a service. The only thing you are doing is moving money from one place to another, and making more money in the process. A counter-argument is that you provide starter capital for companies that could better society if given a chance... but do you? Or do you just buy low, sell high with random stocks, or even worse, survive on dividents from the already established companies?
Some things to think about
I do not trade. I receive only dividends indeed.
Some guy indeed at some point had a company grow. He made it florish and he produced some wealth. I now own the shares he used to own. So according to you he's a good guy and I'm a parasit, right?
Well, consider this: I did not steal those shares from this guy. I
bought them. So in a sense, I
rewarded him for the good work he's been doing. Without people like me, his job would have had much more difficulty to find a correct price in the market. I hope you can understand that.
Are you going to tell me that receiving money from doing nothing is fine as long as you don't pay to do that, but if you do it without stealing anyone, by investing wisely, it becomes morally wrong?