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I dont know, but companies need to keep hiring because of both staff turn over and switch of priorities. Presumably, the people getting hired are for positions that are perceived more valuable by management than the work people being let go are doing.

And of course, companies also have practical right to make mistakes, from overstaffing to understaffing, or to place bets that do well or do not.

The point is that these things would happen even if things were being run perfectly, so they are not indicative of nefarious practices or abuses.