You are using an outdated methodology.
There is no setting of exchange rates as there are no exchanges.

If there is not enough broccoli to meet demand more resources are put into broccoli production.
If there is broccoli rotting on the shelves, less production.

Most production is automated under this paradigm.
There is only so much broccoli desired in the world.
Production is distributed to minimize waste and shipping resource demands.

Production is managed to meet demand and responsible stocking levels to mitigate against natural disasters.
Instead of asking if the huricane devastated area has enough money to buy, we just send them what they need and adjust production to match the increased demand.

Substitute anything for broccoli.
Maseratis, iphones, shoes, toilet paper, whatever.
Production falls on those between 20 and 50.
After 50 do what you please, including continuing to produce, if you so desire, otherwise suck mai tais in tahiti if that is your thing.
Before 20, prepare for your productive years.