If the Federal Reserve buys dollars in the foreign exchange market but does not sterilize the intervention, what will be the impact on international reserves, the money supply, and the exchange rate?

Foreign exchange market refers to the market where the exchange of currencies takes place. it's an area where one can trade for the currencies and through which the provision and demand of a currency are determined and determines the interchange rate of that currency.

So, the rise of dollars through purchase would decrease the international reserves. Similarly, purchase of dollars by the govt would scale back the quantity of dollars within the foreign market which might reduce the money supply for the dollar within the exchange market. So, the acquisition of dollar by the govt would decrease the money supply of the dollar. Purchase of dollar and reduced market supply would increase the demand for the dollar and therefore the increased demand would increase the worth of the dollar that may increase its charge per unit. So, purchase of dollars by the govt. would increase the rate of exchange for the dollar.

Thus, international reserves would decrease, the money supply would decrease, and also the charge per unit would increase under the given situation.