Scissors also don't have to be "consumed", or at least not substantially over the course of a human life. I'd expect them to be durable goods. It's more than possible to make a pair of scissors, for not even that much more that a shit pair, that outlasts the first owner. We just generally choose not to.
> Labor has never been more expensive than now.
Each hour of wages is amortized across dozens, hundreds, possibly thousands of scissors. You could double the wages of everyone involved from manufacturing to fulfillment to logistics to sales and it'd translate to maybe multiple pennies' worth of a per-scissor cost increase.
> Raw resources have never been under more competition than now.
As the other commenter pointed out, steel's still plenty cheap and abundant.
> We as a species are more numerous and consume more scissors than ever before.
That's more than offset by our increased ability to make scissors at scale.
> Supply chains have never farther separated end user from producer, as now.
The whole point of that separation is to drive down costs.
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All in all, the available information points rather squarely to manufacturers being greedy rather than costs somehow forcing their hand.