If (the over-financialized sector of) the economy crashes, volume produced of these physical products may plummet
quality may suffer, top shelf unavailable
but does not mean prices overall will decline much.
The long term trend for 50 years now is the decline of disposable income / purchasing power of those working for a living.
The increasing share of the top few percent rentier class continues to skyrocket, more and more all the income and wealth concentrating at the top.
There is zero evidence of that trend doing anything but accelerating more and more every year.
The saving grace for ordinary people has been so many goods prices staying cheap due to their being made overseas, or otherwise produced using very cheap exploited labor.
Which is less true for manufactured goods using the labor of US citizens.