A product that is been sold for $5 in USA should also be sold for $5 in Canada and China, this way it will help the world leaders to remove hunger in the world, it will also help grow the economy of every country because countries can buy product from one another at a better price, this method will really help in reducing suffering in the world because hunger is one of man's major problem.
The world leaders should sit and implement this policy every product will be given a price that will be comfortable to every common man in different countries of the world.
Before thinking of something like this, you should first consider what the economies of other countries look like, especially third world countries. It will mean more suffering if a country that is struggling with its economy begins to buy products with same price as those who are already comfortable and with a good purchasing power. The efforts should be geared at making the world's economy one where thesame standard of living those in the US, UK, India, China, Japan enjoy should be same those in developing and underdeveloped countries enjoy. Anything aside this, third world countries will suffer the most because majority of the citizens are poor and may not be able to afford products with the world's price tag.
No country is lucky for their citizens to buy products cheap, every country where things are being sold for a low price they worked well for it to be this low.