Are there people treating food as an appreciating asset?
("Homer vs. Patty and Selma", Simpsons S06E17)
H. J. Simpson was doing this back in 1995, though to be fair he was in futures, rather than the raw asset.
1. Manipulates interest rates directly affecting house prices
2. Changes tax rates depending on housing (mortgage interest)
3. Buys mortgages
4. Zones areas which can restrict or increase supply based on policy.
Yes, if they didn’t do any of these, people wouldn’t blame government policy and we’d see what a functioning market results in.
Just because something is traded doesn't make it an appreciating asset. In the case of commodities, they're typically traded as risk management instruments, not something that inherently provides returns.