The algorithmic pricing in rental markets failed because they were not competitive. They were in essence cartel. But Walmart and Amazon surely are there to under-cut each other so it is not same issue.
That sounds like a win for the consumer
>This squeezes the advantage smaller players may have on pricing
Small players competing on price alone with Walmart or Amazon is suicidal. Offering something other than low price is a way to compete.
That’s just a thing people imagine will happen. What actually happens is the big players just competing on price against each other forever.
Let's say that you have a comparative advantage against Amazon. A company went bankrupt and you bought the remaining inventory of lawn darts at a fire sale price.
Now you try to sell your lawn darts at 90% of the Amazon price. And they lower their price to match or be below yours. And this continues. And pretty soon you have to sell your lawn darts at the price you bought them for, and even that isn't really moving them.
Sure, Amazon is taking a loss on lawn darts. But they've also squashed you, preventing you from specializing in outdoor equipment and building comparative advantage against Amazon. You go out of business, and Amazon's scraper see's no price data so they go back to a default price of cost+100%.
And all of this without a human in the loop at Amazon. They just matched your price, and let the network effect they have do the rest to completely drain your customer flow.
But in this case, Amazon is 40% of the market. There is no upstart competitor that can outlast them in a price war.
There is also likely little to no comparative advantage you can have against them, except a legal monopoly like a patented or trademarked product. Even then, if they clone your product, when you sue them it will be a rounding error in their legal budget while you have no cash flow to sue them.
The classical school seems to think that there's a limitless amount of irrational entrepreneurship that will drain Amazon if they price too low. In reality, entrepreneurs are generally not that dumb.
Amazon, of course, doesn't dominate everything. They aren't going to sell every product. There are marginal, low-volume, low return products that they will happily let other companies sell on their platform or elsewhere. But if your product becomes high margin and high volume on their platform, they will know, and they'll be coming for your profits.
The thing is, it's easier than ever to start an e-tailer. I've been using Deliverr (which is now owned by Flexport) which does 3rd party logistics along with Shopify. If Amazon pumped their prices on diapers, it would be really easy to start an online diaper store. The threat keeps them honest to some extent.
Obviously, you can't fight Amazon directly on selling everything. But 3rd party retailers to sell targeted things can be spun up quickly if Amazon lets their prices in any one category creep up too high.
And Amazon competes in individual categories with a lot of people. I can buy a lot of home repair type things on Amazon, or at Wal-Mart, Home Depot, Lowe's, Menards, etc. I can buy a lot of electronics on Amazon, Wal-Mart, Best Buy, etc.
There's a lot of competition in retail in general and likely always will be, there just isn't a lot of competition in everything stores and it's hard to see how that would change.
I wouldn't describe it as unethical. The problem with collusion is more about what happens to companies that undercut the market by a little bit. As long as there are no non-market consequences the incentives should play out as expected. It isn't a problem (indeed, in theory it is expected) that merchants all offer the same good/service for the same price.
If Amazon and Walmart and Target were all using some third party pricing software, the potential for collusion would be severe .
This is just automating something that’s been done manually for as long as competitive retail has existed.
The retail shakeout has been brutal in the urban core of Portland and Seattle as well, anywhere where there isn't nearby housing to create a walk shed that would allow smaller businesses to survive has seen something of a retail apocalypse.
Single purpose office or commercial neighborhoods just aren't viable anymore, you need a critical mass of local customers adjacent your retail business for it to survive.