RIYADH, 2 January — Since the Sept. 11 attacks in the United States, SR90 billion ($24 billion) have been pumped back to the Kingdom’s economy from outside to make the supply reach SR328 billion ($88billion) by the end of November. Saudi economists attributed the unprecedented phenomenon to the fear of the investors about restrictions on the transfer of investments that have been concentrated in the US and Europe. The Saudi investments in the West are estimated at between $400 billion and $800 billion, according to a study of the Saudi Arabian Monetary Agency.