'Perceived' conflicts of interest should be declared, that is the policy.

Now on to your second comment. I think this study does a better job than I can do.
http://www.ryerson.ca/content/dam/citybuilding/pdfs/2017/CBI%20POLICY%20PAPER-In%20High%20Demand-March20171.pdf

Two points. One is that the sudden hyper-leap of prices in Toronto and surrounding area is correlated with the slowing rate of price increases in Vancouver after application of tax. Correlation is not causation, but a sudden and rapid jump is better explained by an external shock than a slow demographic trend.

Two. The key argument of Mr. Clayton's most recent report is that a forecast of demand made in 2006 has not been met. Problem. Forecasts are projections based on past behaviours, demographic/lifestyle factors etc. If the past does not reflect the future, the forecast is incorrect rather than a supply-demand inbalance.