The basic gist is that people did initially deploy it in straight lines but in WWI the explosions and weapons and bombardments resulted in most of the wire becoming a tangled mess.
The surprising result is that people quickly learned that a tangled mess of barbed and/or razor wire is even better at stopping people than straight wire. So they they started coiling the wire during the war and eventually mass produced the product we now call “Concertina Wire”, which is like a death-slinky.
Yes, you’re right it’s more expensive (because you need more) than just straight wire but the goal isn’t to save money, it’s stop people from getting through your wire and the coiled wire is simply a really, really good deterrent.
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