just import plastic and alloy. it is much faster that way. don't stop at processor, instead swiftly move to tv and computer, that's where the bulk load of money is. $190k per shipment. i plot about 4 consumer electronics factory, and 2 processor factory. and i earn about 5 mil per month, after paying for city maintenance it reduce to about 2 mil, but at least my sims need not to pay tax haha