Perhaps an improved alternative would be to use an equally aggressive continuous exponential decay system on accounts as the method for redistribution. Decay in large accounts and growth in small accounts effectively making it more difficult to make money from money stores.
You don't need to involve an exponential function. Let´s say you have a flat x Coin tax per year for every valid address, and percentage demurrage on top of that. If you can make a lottery of redistribution of the demurrage, even just a draw between all active accounts, you will be able to statistically redistribute from the wealthy few to the many poor (the extreme example is only one winner who gets the whole yearly demurrage). This will imply a loss of anonymity as the standard tx-es function today, which has to be countered in some way to make the coin practicable (maybe with ZeroCoin,
https://bitcointalk.org/index.php?topic=202664.0 )