I would test it out in third world countries first. I would enslave them economically, and thereby take their land. The land would be owned by the banks and the multi-national orginizations which hire private security armies (mercenaries) to defend them. I would withhold food and water and spread disease so the people are too weak to revolt. Any currency they use will be valueless if there is no food for them to eat. If they do get strong enough to revolt, I would take out the leader of their country and put in a new one that promises changes, but doesn't deliver.

Yes, people can use whatever currency they want, but if it is not backed by anything of real value their currency will be worthless. If they don't own their own land, then they are powerless. Then they have to work on a plantation that supplies us with bananas while they can't even earn enough money to buy a banana. But if they cooperate, they get a roof over their head and a good square mean a day.

If I wanted to take over the world in a different way, I would become president of the U.S. and go live in an undisclosed location where I would declare a new country with new laws. It would take me time to think up what these new laws would be, but basically I would become a kind dictator. I would encourage a new industry in alternative energies like solar, wind, wave, hydrogen cell, etc....and at the same time implement amazing public transportation. I would raise the price of oil so it is basically unaffordable. I would create a department of peace. I would declare that corporations do not have the same rights or more rights than people, and I would require them to pay their fare share of taxes. I would redistribute the land and make it so that housing is free. I would legalize all victimless crimes. I would make this new country an example of a cutting edge futuristic vision and urge other countries to modernize and not be left behind. Of course i would have to be in an undisclosed location so that I wouldn't be assassinated. I would try to centralize farming and industry to each location in order to empower communities to be self-sufficient as much as possible. I would halt the production of poisons as much as possible. With clean renewable free energy there will be no more mountain top removal polluting the rivers and oceans with mercury. With prosperous communities and a nation of happy people, hopefully the idea would catch on. There would be so much to do and think about that I would probably not be successful, but at least I could try. I live how Bolivia and Bhutan have made efforts in this area.