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First, the government does force you to use USPS for some things.The person you were replying to was referring to USPS's upcoming banking services, not their mail services.
> we all pay for USPS as taxpayers regardless of whether we use its ancillary services
We do not. USPS has its own books and does not receive taxpayer funds directly[1][2].
> To me these are both reasons for the government not to get into this business. If Walmart offers a lower price, whether that's a loss leader or not, it's great for consumers.
The problem is not that banking services are unavailable or that Walmart isn't offering them cheaply. It's that Walmart isn't guaranteed to continue to offer them cheaply, and it doesn't serve nearly as many rural places as post offices do.
There are post offices absolutely everywhere in the US. The same is not true of Walmarts.
> IMHO govt services make sense when private industry can't provide them effectively. That doesn't seem like the case here.
25% of Americans are underserved by banking as of a few years ago, so obviously something is wrong that the free market has not been able to solve[3]. Retail banking is not very profitable, so there isn't much incentive for existing banks to do a good job of it.
> I'm guessing they'll just ask for $1b more in funding the following year
Again, that's not how USPS works.
> And if check cashing seems like a good direction, should the government develop its own reward credit cards? Buy now, pay later? Crypto exchanges? Etc.
Ah, so we get to the "what about the slippery slope?!" part of the argument.
It's not black and white. We need to assess each case based on real data, not based on theory. No one is saying the government should compete in every industry just because it wants to cash checks for people who have been exploited by payday lenders.
We have nationalized libraries and schools, but somehow we haven't slipped down the slope to nationalized grocery stores. I think we'll be OK if USPS offers a very simple service that isn't far off from things they already do (like cashier's checks).
1. https://www.brookings.edu/blog/up-front/2020/08/26/how-is-th...
2. https://facts.usps.com/top-facts/
3. https://www.cnbc.com/2019/03/08/25percent-of-us-households-a...