I don't believe there's any way to quantify the sales volume of domestic or imported tools, unless you can cite some numbers.
On the ratchets: I finally wore out my little #2875 Indestro round-head fine-tooth ratchet about 20 years ago (after using it for over 20 years.) I installed a repair kit in it, but that only fixed the problem for a short time; I literally wore out the splines in the ratchet body. I do not count that as "breakage" or consider it something that should have been a "warranty" issue (which is actually a moot issue since Indestro went out of business in 1990.)
I see mentions of "breaking" ratchets or ratchet "failure" in many posts here and I have to wonder if a breaker bar would have been a more appropriate choice of tool. I've managed to remove a lot of rusted, frozen fasteners and have never "broken" or "stripped" any ratchets; my 1/4", 3/8", and 1/2" breaker bars all have a lot of miles on them.
Let me toss this out there regarding "warranty":
As the buyer for a wholesale warehouse distributor supplying a small chain of auto parts stores (and dozens of other accounts), I handled all of the warranty items that were returned and dealt with the vendors' representatives getting credits for those items.
We kept all of the warranty returns in cardboard boxes, arranged alphabetically by manufacturer's name, and once or twice a year we'd write it all up on a return goods request, or the sales representative would come in and write it up and we'd get a credit for it.
The box which held the Indestro warranty returns was about the size of a toaster. Guy Wheaton, the rep, would come up maybe once a year and write the stuff up. Never had any problem, even with the stuff stamped "Not guaranteed" (little hex-drive or clutch-drive attachments.) Over the course of a year, we'd have maybe 15-20 pieces in that box, most of which (as i recall) were 1/2" drive deep-wells that chuckleheads put on impact guns. All that from no fewer than nine stores (all of which had full boards behind the counter) and a mess of other accounts that picked onesie-twosies from us.
Uncle Harold thought we should have short blocks and heads ready to go on the sales floor, but didn't want to tie up a bunch of money in engine cores, so he cut a deal with a local wrecking yard and had them deliver four complete small-block Chev engines to one of our stores. All still had manifolds and tin bolted on - carburetors, starters, alternators, and power steering pumps had been removed.
I disassembled all four of those engines one night in the back room of the Tillicum store with a 40-piece Wilmar socket set. My tools were at home, and I wasn't about to get grease all over nice new tools off the Indestro boards.
The arguments about "warranty" are completely blown out of all proportion.
It ain't the wrench - it's the guy turning it.