private static void exchange(GrandExchangeOffer seller, GrandExchangeOffer buyer) {
		if (buyer.isSell() == seller.isSell()) {
			return;
		}
		if ((seller.isSell() && buyer.getOfferedValue() < seller.getOfferedValue()) || (!seller.isSell() && buyer.getOfferedValue() > seller.getOfferedValue())) {
			return;
		}
		int amount = seller.getAmountLeft(true);
		if (amount > buyer.getAmountLeft(true)) {
			amount = buyer.getAmountLeft(true);
		}
		if (amount < 1) {
			return;
		}
		int coinDifference = seller.isSell() ? (buyer.getOfferedValue() - seller.getOfferedValue()) : (seller.getOfferedValue() - buyer.getOfferedValue());
		if (coinDifference < 0) {
			return;
		}
		if (EconomyManagement.getEcoState() == EcoStatus.DRAINING) {
			coinDifference *= (1.0 - EconomyManagement.getModificationRate());
		}
		seller.setCompletedAmount(seller.getCompletedAmount() + amount);
		buyer.setCompletedAmount(buyer.getCompletedAmount() + amount);
		seller.setState(seller.getAmountLeft() < 1 ? OfferState.COMPLETED : OfferState.UPDATED);
		buyer.setState(buyer.getAmountLeft() < 1 ? OfferState.COMPLETED : OfferState.UPDATED);
		if (seller.isSell()) {
			if (seller.getAmountLeft() < 1 && seller.getPlayer() != null) {
				seller.getPlayer().getAudioManager().send(new Audio(4042, 1, 1));
			}
			seller.addWithdraw(995, amount * seller.getOfferedValue());
			buyer.addWithdraw(buyer.getItemId(), amount);
			BuyingLimitation.updateBoughtAmount(buyer.getItemId(), buyer.getPlayerUID(), amount);
		} else {
			if (buyer.getAmountLeft() < 1 && buyer.getPlayer() != null) {
				buyer.getPlayer().getAudioManager().send(new Audio(4042, 1, 1));
			}
			seller.addWithdraw(seller.getItemId(), amount);
			buyer.addWithdraw(995, amount * buyer.getOfferedValue());
			BuyingLimitation.updateBoughtAmount(seller.getItemId(), seller.getPlayerUID(), amount);
		}
		if (coinDifference > 0) {
			addCoinDifference(seller, buyer, coinDifference, amount);
		}
		seller.getEntry().influenceValue(seller.getOfferedValue());
		seller.notify(UPDATE_NOTIFICATION);
		buyer.notify(UPDATE_NOTIFICATION);

//		buyer.sendBuyResultMessage(seller, buyer);
//		seller.sendResultMessage(seller, buyer);

		dumpDatabase = true;
	}