Revealed! Publicly traded companies that are as big as entire countries and how to invest in them

Powerful global corporations have existed throughout history. However, today's corporations are nothing like those of the past - not in terms of size, market cap and influence, anyway. Indeed, so big are some of today's global corporations that their market caps actually dwarf the economies of many of the world's countries. Others come quite close to matching the GDP of some of the world's richest countries. So, which companies have such big market caps, and how can investors invest in them? Read on to find out. Just how big are the market caps of global corporations? Finder.com, the personal finance…