The float is essentially double-counted money: a paid sum which, due to delays in processing, appears simultaneously in the accounts of the payer and the payee.
Individuals and companies alike can use float to their advantage, gaining time or earning interest before payment clears their bank.Investopedia
One of the great tragedies of the NYC MTA is that it’s a too-much-public-not-enough-private transit cash pipe with too much exposure to local NY politics. NYT has a wonderful video on YouTube that explains the critical MTA flaw: politicians cleverly borrow against the MTA cash pipe for pork barrel projects that have little or nothing to do with MTA, but leave it highly leveraged and helpless to fix it’s own problems or invest in infrastructure.
Think of what MTA could really do if it was effectively protected from political interference, with full control of its own money and a Suica-like transit+payment empire, free to use the float of all those MetroCards soon to be OMNY transit cards.
One of the many things never discussed about open loop is who uses the float, but banks hold the money until the user account is settled with the transit company and they take a cut of the fare. It doesn’t take much imagination to see why banks and credit card companies really like promoting open loop.
Closed loop Japanese transit companies don’t talk about the float either but Japan IC Transit cards are like micro bank accounts with unused e-money balance and plastic card deposits sitting in all those Suica, PASMO, ICOCOA, manaca, etc. Japanese transit companies love to put all those micro bank accounts to work earning interest.
Japanese transit companies and Hong Kong Octopus have built those micro bank account transit cards into a very nice transit payment platform business that combines transit, payments and other services attached to the card which means there’s a lot more stored fare floating around than plain old transit-only cards. The addition of digital wallets like Apple Pay Suica and Apple Pay Octopus means there’s ever more e-money moving through those cards with short term parking…more float for transit companies to earn interest.
It’s a wonder why more transit companies haven’t followed the transit payment platform model to capture more business in the digital wallet era, but it’s testament to how little control they have over their own business destiny. Next time when you hear the praises of open loop over closed loop, remember to think about who’s floating in that business arrangement…and who’s not.