When you say the name Visa (NYSE: V), the next name you think of is (NYSE: MA), and vice versa. That's because these two payment processors are the dominant players in their industry. Mastercard is the smaller of the two companies, but it is still a powerhouse. Investors have high expectations for it. Here's a trio of reasons now might not be the best time to buy this finance industry heavyweight.

Every time a consumer uses a payment option that has the Mastercard logo on it, like a credit or debit card, Mastercard collects a transaction fee. Given that most people that use cards are simply trying to replace the need to carry cash, credit and debit cards get used a lot. Being the largest players, Mastercard and Visa -- perhaps justifiably -- come under a lot of government scrutiny. And the list doesn't stop there; customers are also leery of the power these two companies wield.

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Source Fool.com