J Studios/DigitalVision via Getty Images Introduction The financial industry is fascinating for a number of reasons. It's huge! According to Investopedia, the financial services sector could be 20-25% of the world economy. It's home to many fascinating companies that have made great investments in the past. This includes rating agencies, service providers, ETF operators, banks, investment advisors, and others. It's increasingly becoming a battleground for market share, which comes with both risks and opport ...