Poor people are less likely to be homeowners who can make that investment in DIY. Instead their time cost is chasing up a landlord who is slow to do repairs. I

Poor people are less likely to be homeowners who can make that investment in DIY. Instead their time cost is chasing up a landlord who is slow to do repairs. I do agree with your wider point though, and car maintenance skills are especially valuable to poor people keeping an older car running.