If all money become deflationnary, countries will have to move almost all taxes to wealth taxes, which is, now that i think about it, not a bad idea. I might be convinced now :P
In Islamic economy interest is forbidden, there are no taxes and every Muslim is required to give 1/40 of their wealth to the poor every year (zakah). It is collected mandatorily and distributed by the government. Non-Muslims pay an annual protection tax aka jizya, in exchange for not paying zakah and not serving in the army. Modern scholars argue that collecting tax is permissible because of modern needs and responsibilities of the government (e.g infrastructure building), but only the strictly needed amount.
