For some horrendous statistics, have a look at this http://www.btselem.org/ , the website of an *Israeli* human rights organisation. One quote:
"Ninety percent of [Gaza] factories and industrial workshops have closed, and the rest have had to scale back operations. After Operation Cast Lead, the International Red Cross reported that 3,750 businesses had closed and that approximately 40,000 persons (some 94 percent of workers in these businesses) had lost their jobs."