Let's tune your question a little.
Trying to consider economical results, we have to have correct input data.
- corporation gets the power to produce any object in space, at current tech level.
Organic or not organic from materials and resources found in solar system.
instead of original: One day, one corporation gets the power to produce any non-organic object in space, of up to a few kilometers in size, at virtually zero cost.
Given that the corporation with this technology would of course copyright it and have a monopoly.
Not necessarily the case, because of: Assume earth today, no sci-fi tech of any kind available.
So it will be a set of technologies, and pretty big one, based on current technologies which are already patented etc. Let's call that problem as P1 in future.
Fuels are not a manufactured goods and will most likely remain as abundant as present.
One of space advantages, and what actually makes such corporation viable, is energy source, in form of solar energy, in quantities exceeding your today dreams, and way much cheaper to collect, if someone may produce in space everything he needs.
So it's expected to supply earth with energy - because it's easiest thing to transfer from orbit/space to earth, where it can be used.
Big pie, problem P1
There is no way that some corporation will have uncontrolled advantage over that set of technologies. Control over this situation may be easy done in legal field and by any shadow action imaginable if necessary.
Actually legal action allows wide range of how to control that corporation and there is no way how that corporation may act alone and be not ruled by government in a proper way.
Let say as example space is outside border, so why not to use customs duties on imported goods.
Such a corporation can't appear from nothing. It has to begin with something and that all will take time, years, which is long enough to create all law needed, if current set of rules will be not enough.
Before something can be done in space, something has to be deployed in space. And there aren't many countries where it can be done (at the moment). Countries where you may launch something in space. And everything isn't so easy, you have to have bunch of permits, certificates for that.
Closest company, which may emerge that way, is SpaceX. And they already are connected to government, NASA, investors, etc.
Ability to transfer our technologies to space is big deal actually, game changer of game changers like NASA says.
Probably more important there are some advantages for such corporation in collaboration with government, for both of them, win win situation.
It's also important to recall we have not only Government №1, but also 2, 3, 4, etc up 195 of them, and ca 50 of them have noticeably world impact, not necessary economical.
Economically for earth - nothing astonishing actually. Democrats will win, Bernie will burn and shine, some currency will raise some fall, guaranteed income will win, land on equator will rise in price, oil price will fall.
To keep that advantage corporation will have to attract people, because any technological development is done by people, at the moment. And if someone has done something, so may do others, at least first 10 countries are capable.
Mars colonization and O'Neill cylinder will not be a fiction any more.
It will start active development of Space elevator and Launch loop
More automation, less cheap labor, more education, research, programming.
Some people will get internet and 100$ computers - as it was promised. So we will get more accounts in FB from countries we not know at the moment.
Ocean city may become reality.
For producing more fish and fish food, will make working earth Climate model. It helps to illuminate regions in ocean, to faster fish re-population, by growing more algae. So importance of biology model also will be very high. So more travel, more fun with animals, more researches about them.
Corporation is not a beast with own will, but people.
Main impact will be social and politics.
Main general impact for humanity - space will be finally inhabited, and that's is very big deal.
Importance of earth will fall in 60 years.
You born in space city.
Aliens will fear us.
We become type II civilization in 100 years and will be on your way to type III in next 2000 years.
Take place in galaxy's council.