This is a very basic question about the Stock Exchange, and I was looking for some concrete answers with a general understanding of how it works.
When a Stock Exchange is open for business in a country showing Public Limited Companies which are floating on said Stock Exchange, I assume that people within that country get 'signals' as to whether the current share price is going up, or down, before someone from another country, around a millisecond faster? Thus, if one could quickly stop time with a magic watch, walk across the Earth to another country, and quickly lock in a trade they would make the correct decision resulting in profit?
I will note, however, that the United States of America seems to use some form of lag, on purpose, so that they get up to date information which Tom Scott reports on.
Why do I ask? Because I have developed a physics technique to transfer a flag (which could represent a price going up or down) from a country, to another country, faster than anything currently available on the market. I believe I could pay off my student loan with this if I can hook up my physics device to a computer, and have a receiver in another country that inputs the trade.
Edit 1: to clarify I am happy to trade anything, for example foreign currency exchange (FOREX), so long as me knowing what a company within a country does quicker than everyone else gives me a competitive advantage.
Edit 2: I assume if I am trading on the London Stock Exchange, but knew something about the New York Stock Exchange before the London one I would have an advantage? I know nothing so please correct me.