Answer (from The Guardian): 21 cents/transaction (down from 44 cents in 2010).
This may seem like a trivial amount but think of the volume ($1.4 trillion, see if students capture the error in the article). Those so-called interchange fees represented about $16 billion in fees that banks received annually from retailers, who presumably passed that cost on to consumers.
So, what’s the problem with the fee being reduced to $0.21 (which by the way, the Supreme Court ruled cannot be raised)?
You guessed it. The banks saw a multi-billion dollar source of fees reduced and obviously need to make it up elsewhere:
Banks have been lobbying relentlessly, but in the meantime they have found a more effective method: taking the difference out of consumers’ bank accounts. Is it a coincidence that since the passage of the Durbin amendment, banks have boosted the size of the balance required to qualify for free checking? Monthly account maintenance fees – and all other kinds of bank fees – have also soared.
So, next time you curse that monthly account fee that you pay your bank for the privilege of having a checking account, know that it probably has something to do with that interchange fee reduction.