Mastercard Stock: Buy, Sell, or Hold?

Payment network Mastercard (MA -0.01%) has done very well for shareholders, despite playing second fiddle to archrival Visa. A mere $1,000 invested in Mastercard at its IPO in May 2006 would be worth over $104,050 today.Today, Mastercard is one of the world's largest financial companies, worth over $412 billion in market cap. Now that it's a behemoth, future investment returns probably won't be as lucrative.However, Mastercard can still be an excellent stock to buy and hold, depending on the answers to thre ...