There's "crazy cheap" on Amazon, and there's "crazy cheap" second hand, but there's likely an order of magnitude between them.
Annecdotally here 2nd hand books cost around $2, for recent stuff, sometimes less than $1 for age or condition. New ones are $10 - $15.
So new and 2nd-hand are not really "competing" with each other, price wise.
Yes they compete, yes there are many other factors that affect the profitability of 2nd hand stores, but I don't think price-of-new is a major factor (in a decline sense.)
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There's "crazy cheap" on Amazon, and there's "crazy cheap" second hand, but there's likely an order of magnitude between them.
Annecdotally here 2nd hand books cost around $2, for recent stuff, sometimes less than $1 for age or condition. New ones are $10 - $15.
So new and 2nd-hand are not really "competing" with each other, price wise.
Yes they compete, yes there are many other factors that affect the profitability of 2nd hand stores, but I don't think price-of-new is a major factor (in a decline sense.)