单项选择题

A tax placed on a product causes the price the buyer pays
A、. and the price the seller receives to be higher.
B、. and the price the seller receives to be lower.
C、. to be lower and the price the seller receives to be higher.
D、. to be higher and the price the seller receives to be lower.

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In the foreign exchange market, ________ seek all of their profit from exchange rate changes while ________ seek to profit from simultaneous exchange rate differences in different markets.
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B．central banks; treasuries
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