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.
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”.
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.
If everyone gets 1B tomorrow an amazon share will just be a lot more expensive. You are assuming Bezos holds all his wealth in cash.
Inflation, and war.