Excerpted from this website:
There are two ways PayPal makes its money. The first way is the fees they charge to a payment’s recipient. Although most transactions are free, merchants pay a fee for each transaction.
I don't know wether this question fits here or not, but I can't understand the above article, in my understanding, merchants pay a transaction fee, how can it still say most transactions are free?
Or does it mean "Although most transactions are free, some merchants pay a fee for each transaction"? It's extremely confused to me, do "some merchants" = "merchants" automatically?