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a classical collateral secured transaction is fundamentally different than a repo as describedYou shouldn't be downvoted. The observation is correct.
In a collateralized loan, the borrower owns the collateral. In a repo, the borrower does not. This is one reason why companies finance capital equipment with secured loans, not repos.
A repo also involves two collateral purchase-and-sale transactions; a collateralized loan involves zero. This restricts it to highly liquid assets, where everyone agrees on prices and settlement is fast and cheap. In practice, this almost exclusively means Treasuries.
I was handwaving when I said they're the same transaction. They're symmetrical, cash-flow wise. But you can't replace secured loans with repos or vice versa. Repos are secured borrowing with minimal counterparty risk. Secured loans are secured borrowing with broad asset coverage.
> a classical collateral secured transaction is fundamentally different than a repo
Not fundamentally. Just different. (I'd also note that the "classic" collateralized transaction is a spherical cow.)
Lender leasing the collateral to the borrower makes a repo functionally identical to a secured loan. Lenders requiring ring-fenced collateral (e.g. in a cash-backed loan) are repos with extra steps. This symmetry belies their fundamental similarity.
There are legal differences in edge cases. But fundamentally, they're both collateralized borrowing.