In media, there are sometimes stories where a person is cloned/duplicated (usually with identical memories) and the clone is murderous towards the original. Usually it’s something like “I knew there could be only one of us, and you would do the same”. Sometimes, they’re able to work things out and can share a single public identity, or duplication gives one copy a chance to do go off and live a new life that they always wanted.
How would you and your duplicate get along? Assume you are living like you do today, in a society where duplication is unheard of and has no legal precedent.
A friend who thinks exactly the same as I do and can get excited at the same ideas? Hell yeah, we’d be inseparable. I have so many projects that would be much easier done with two people. Also, free gym buddy/trainer. My partner would be into it as well for a multitude of reasons. The only trouble would be living space.
I can’t think of anything worthwhile we can do as a single legal entity so first thing we’d do is probably acquire a new legal identity so we can legally work and be taxed separately and just generally participate in society. It would be pretty easy to prove that we’re genetically identical and therefore are identical twins born at the same time at the same place to the same parents. Everything else can be chalked up to clerical error. The people in charge of this aren’t paid enough to care and dig any further than that.