Hello Craig,
Thank you for your comments and especially your links.
In general, I think the 'market portfolio' is easier to imagine conceptually - race your mind to the idea of infinity - than it is to buy in reality. There are so many markets, both public and private, and so many asset classes, including things like leisure time, art collections, mid-century modern furniture, and so forth, that it is very difficult to 'buy' the market portfolio.
Yours, in service,
Jason