If a tax on capital is instituted are there mechanisms to value such cases?
Second, an actual business of that size would probably be owned by some other corporate entity created for that purpose, not an individual, and that entity would be paying its own taxes.
Finally, Warren and Sanders both plan on beefing up the IRS to answer these kinds of questions, which will certainly be thorny for some kinds of assets.
Only for wealth stored as currency. For debts, inflation effectively transfers money from lenders to borrowers by reducing the value of debts. Other things, for example stocks and real estate, are only nominally affected by inflation.
No, it's a “tax” on net holdings of the currency that is inflated.
That's not the same thing, as wealth in non-currency-denominated assets or assets denominated in a different currency aren't “taxed”.