In this Youtube video Nancy Pelosi explains why unemployment insurance is a good deal for the economy .
She says that people spend their unemployment checks almost immediately and that the money goes straight into the local economy where it creates jobs. This is the typical American double-edged charity - get something for myself by being charitable - but it nevertheless did remind me of the underlying reason behind Zakat: to keep money in circulation.
Talking about money in 7th century Madinah may be somewhat of an anachronism. At that time the Arabs were at a transitional stage between barter and cash economies. Six commodities were used for exchange. These so-called /al-sila3ah al-sittah/ were gold and silver, wheat and barley, dates and salt.
Zakat was more of a penalty than a tax. You could avoid paying it by spending your money and keeping it in the economy. If you preferred to hoard wealth, then you would pay a penalty on it of 2.5% per annum, until your entire hoard was dissipated. The beneficiaries of zakat are also narrowly restricted by the Quran itself.
So, where does the state get revenue?
There is a land tax or khums. I believe this is also regarded as zakat so cannot be spent on many kinds of things.
Looking at the power of the state in Shariah, we see that it can collect zakat, that it can organize the community for its common defense, that it can enforce law derived from Sharia sources and administrative laws deemed ancillary to that purpose, and that it can sustain its own administrative apparatus from zakat funds. That's about it.
I expect that scholars - particularly those sponsored by the political authority - would attempt to dilate the power of the state following a trajectory of "helping the helpless" and national security, much as has been done in the US. It's too bad that "Islamists" are so obsessed with reactive politics and ranting about "kufar" - there is much more important work to be done.
