I'm quite sure if you spend money on the same goods like during that day - you can sustain a family. Small house with asbestos, little amount of home appliances, basic small car, no food delivery, no AC etc.
The essential costs - housing, healthcare and education - have far outpaced inflation while the cost of food and appliances has not. How can a single income compete in buying from the limited supply of houses against dual incomes?
You do have to intentionally budget but you can raise five+ kids on a single salary if you want to.