You're right that it has been said, but I'm afraid I'm very bad at remembering who said what, especially when the same ideas come up time after time.
Many (35+) years ago I had a boyfriend who was doing a PhD in the effects of home ownership on the nation's economy. He sometimes discussed his research and I remember that it was the first time I had ever thought about an individual's money management and the effect on a nation's economy. There was a lot more to it, but the underlying thesis was that too much money in the UK is invested in home ownership, which has become more attractive for individuals than investment in business or services which benefit all. Comparisons were made with other countries. Over the last 35+ years, the UK has suffered for that.
I've been interested in economics because I worked at Reuters' economics news desk for a while and got to know some of the people working in investment and on the markets and the terminology they use. Both my children have studied economics as part of their degrees. Interestingly, my daughter has a humanities postgrad degree but doesn't know that much about how the City operates, although she's a mine of information about how economics (eg. the New Deal, the Depression, post WW2 socialism, etc) have affected history. My son has an MSc in politics and economics, so has looked at economics from a different angle. He uses a lot of high level maths to understand modelling, etc. The point is that "being an economist" is as varied as (for example) "working in construction", which includes everybody from the accountant who understands investment potential to a bricklayer and everybody else with specific skills.. It doesn't make either of them an expert in knowing how much housing is needed for the whole population or the politics of home ownership.