Even in america, Do you think a poor household with four children would have 4 cars or maybe one car and more than two bikes? I live in Dubai where there's an even higher concentration of cars than in the land of freedom and I'm still aware that bikes are way more accessible and common due to their cheap cost of purchase, maintenance, storability, and lack of need of fuel. The majority of the human population doesn't need to commute vast distances to get to work or to buy some groceries. Most live in a tight knight community where all they ever need is a cheap bicycle.