Because in addition to that $200 for the bus ticket, they'd also need money on hand for first month's rent, security deposit, probably some new furniture and houseware, etc. plus enough saved up to be able to commit to the lease without knowing how much income they'll have... if/once they do manage to line up a job.
it takes fewer weeks of work income to buy a car today than in the early 1980s, and inflation-adjusted gasoline prices didn’t get out of line until a few years ago.
"Fewer weeks of work income" only helps if you have work income.
Maybe the authors have gone too long without wondering where next month's rent is going to come from?