The 'Honor All Cards' policy says if you're a retailer and...

The 'Honor All Cards' policy says if you're a retailer and you take my credit card, then you have to take my debit card. Then whatever new product I come out with, you're forced to take all of these additional cards. It's a classic tying arrangement. Visa and MasterCard have attempted to monopolize the debit card market, and one of the ways is through these tying arrangements.