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At least thinking is a cheap hobby.

Not if food is expensive.

but food hasn't been expensive (as a percentage of income), and more automation can only make it cheaper.

As long as workforce is needed cheap food will be somewhat cheap.

If you don't have a job, everything is expensive.

As log as your don't desire a house to do the thinking in ;)

Simple living is beneficial for deep thinking; see Walden [1]