[patrickwiseman]

The simpler solution to the proposed problem is an estate tax on capital holdings. This could be done by simple requiring the shares be sold on death and repurchased in the beneficiaries name.

Mark-to-market adds voodoo to tax valuation, has the government managing investor cash flow, and rewards investment losses more than the current system. Why reward poor market performance?

Personally, I think this seems like a suggestion for bad governance trying to appease wealth envy.