There’s a chapter in the book where he talks about the economics of being a biker/drop out/artist circa 1970.
A biker could work six months as a union stevedore and earn enough to stay on the road for two years. A part time waitress could make enough to support herself and her musician boyfriend.
Or, to put it another way, in 1960 minimum wage was $1.00/hour and the cost of the average home was $11,000.00. A burger flipper could get hired on high school graduation day and be a home owner in 20 years without ever getting a raise.