In 1900, most people walked to work, school, shopping and socializing. The percentage of the average household’s budget devoted to transportation was so low that the Census bureau didn’t even bother to collect data on it. Today, the average household spends 21% of its budget on transportation. It’s the second biggest single cost after housing yet people take such spending for granted and easily factor it in to their personal budgets. We do so because transportation costs rose slowly over the course of the last half century while other costs, such as food, decreased. Decade after decade we gradually became used to spending more and more for transportation till now the average middle-class family easily accepts spending several thousand dollars a year in transportation costs.
As a thought experiment, imagine that for some reason people never had to individually pay the cost of their own transportation.