At present, the restrictions imposed by Israel on Gaza include not only essential supplies and building materials, but even shekels. Indeed, in the first days following the war, the only significant supplies of currency in public hands was controlled by Hamas, which had smuggled the money in through the tunnels. Since Hamas took over the Gaza strip in 2007, Israel has allowed only three shipments of money to enter since June 2007. Since Israeli shipments into Gaza must be paid for with currency, the currency shortage also a direct impact on trade.
Yet another example of how Israel's blockade of Gaza undermines its own objectives, unless the objective is deprivation.