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In page Palestinian Authority:

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Some Palestinians are dependent on access to the Israeli job market. During the 1990s, some Israeli companies began to replace Palestinians with foreign workers.[citation needed] The process was found to be economical and also addressed security concerns. This hurt the Palestinian economy, in particular in the Gaza strip, where 45.7% of the population is under the poverty line according to the CIA World Factbook, but it also affected the West Bank.