What I didn't realise why quite how sceptical she is about the usefulness of the concept of ownership as applied to the company-shareholder relationship:
In large publicly traded corporations, the normal rights that constitute ownership of real property have been unbundled and parceled out to numerous participants in the enterprise. Many physical assets may be involved, as well as many intangible assets, and the various rights and responsibilities associated with those assets are carved up in different ways. Thus taking "ownership" as the starting point in discussions about corporate governance, a point from which certain rights or claims are supposed to flow, is quite problematic... [T]he common assertion that "the shareholders are the owners" of large corporations is a highly misleading statement that often does more to obscure the important issues than to illuminate them.
I'm obviously fairly sympathetic to this argument. I think the ownership concept is a useful one for getting people to think about how we ensure that companies are run properly (or as well as is possible in the circumstances). But when you get into the detail, it can indeed be a bit of a misleading way of looking at things, and as a result may lead to policy ideas that are unlikely to have much impact.
I think Tomorrow's Company were on the money when they said that ownership is a 'helpfully inaccurate' way of thinking about shareholders and companies.