Generally, however, the banker can obtain gold bars from the United States Assay Office at the nominal charge of one twenty-fifth of 1 per cent., although at times a larger charge is made. The banker prefers bars, because on these there is no loss by abrasion; the Government can afford to give bars, because their export prevents the export of coin, and so saves the cost of coining new money to replace that shipped. Now for gold import. When there is a large volume of bills offered to bankers, perhaps by grain and cotton exporters, and but little demand from buyers of exchange, the market gradually declines in price, while New York bankers, sending abroad the bills they buy, with little occasion to draw against them, accumulate large sums to their credit in London, with no way of getting the money back to New York through operations in the exchange market. They are not, however, helpless; they can order gold sovereigns sent here, and, once here, can have them melted down at the United States Assay Office and coined into eagles and double eagles, which they can deposit with their banks. Obviously, the amount received in dollars for each melted sovereign will mark the price the banker can afford to pay for sterling bills, and competition among bankers will prevent the rate of exchange from declining below this point by more than a fair margin of profit. The British sovereign, if full weight, will, when sent here and melted down, yield gold for which the United States Assay Office will pay $4.8665; the expense of sending the sovereign, freight, insurance, cartage, and kegs, will amount to about one quarter of 1 per cent., so that the net yield of the full weight sovereign in dollars will be $4.85-3/8. But between the day on which the banker buys the bill of exchange in New York and the day on which he receives in New York the gold which the bill entitled him to collect in London, there must elapse the time needed to send the bill to London, plus the time needed to send the gold back (roughly fifteen days), during which period the banker loses the use of the money. This loss of interest must be deducted from the net yield of the imported sovereign, and thus, if money is worth 6 per cent. per annum, the net yield of full weight sovereigns is brought down to about $4.84-1/4, which is the gold import point for demand exchange, when money is worth 6 per cent. per annum. Losses by abrasion will bring down this point by perhaps one-tenth of 1 per cent., to about $4.83-3/4. When money is higher, the import point will be lower, and _vice versa_. There is therefore a margin of profit in buying demand bills and importing gold sovereigns against the purchase, whenever the rate for demand bills falls below the gold import point. Active exchange bankers take advantage of this profit whenever exchange prices decline to the proper point, and their competition in buying bills to cover their gold importations stops further decline in exchange rates.