Adam Smiths' theory of the general glut is they won't. It's a vicious cycle effect that can lead to phenomena called recessions and depressions resulting in strangely both unemployment and idle factories (able workers + money to pay them and nobody hiring due to lack of demand).
Some really ardent neo-classicalists say they don't exist but I haven't read their evidence carefully enough to speak to it (here's an intro by Rothbard if you're interested: https://mises.org/library/says-law-markets)
I personally think some of the most notable Austrians had a bad habit of using arguments of convenience to defend the financial interests of the wealthy benefactors who funded their institutions and reversed their arguments when expedient but that's a separate conversation.
Some really ardent neo-classicalists say they don't exist but I haven't read their evidence carefully enough to speak to it (here's an intro by Rothbard if you're interested: https://mises.org/library/says-law-markets)
I personally think some of the most notable Austrians had a bad habit of using arguments of convenience to defend the financial interests of the wealthy benefactors who funded their institutions and reversed their arguments when expedient but that's a separate conversation.