Inflation and the devaluation of the dollar:
This popped into my head and I thought of looking into it.
In my whorin' around days, the street girls were normally 20 bucks. Value for the dollar and cost-benefit were tremendously greater!
$20 in 1990 is equivalent in purchasing power to about $48.25 today...
https://www.in2013dollars.com/us/inf...1990?amount=20