The numbers don’t lie: The housing crisis is not caused by a supply shortage
(www.policyalternatives.ca)
Household, not house.
In 1900, people in the West lived with extended family members, like in essentially all other cultures. By 2000, not so much. In between it varied by socio-economic class. Your 1970's family might include grandpa if they're not rolling in it.
Most likely, that's what you're seeing on the bulk of this graph.
It’s not as simple a story, but it actually offers a reasonable explanation for the observed data,
No, no it doesn't. I'd explain why, but that would be the exact same comment again.
ECON101
What, do you have an economics degree?
You can't shit on other people's education unless yours is better.