3. How would consumers who traditionally pay using cash potentially benefit from an interchange fee cap?

The interchange fee cap would reduce the cost of doing business for the merchant, so they might reduce their prices slightly for all customers as a result.

I hope this helps

Since the cost of sales using debit and credit cards would decrease, the price of goods and services should also decrease. If the interchange fees are extremely low, then all businesses should adopt debit card and credit card payments as equal to cash payments.  

This will probably lead to more cash paying individuals deciding to use debit cards, and maybe even credit cards.

Explanation:

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