public boolean newBid(String amount, Account buyer) {
		try {
			if (bidsCatalog.size() > 0) {
				Bid current = this.getLatestBid();
				if (Double.parseDouble(current.getAmount()) > Double
						.parseDouble(amount)) {
					return false;
				}
			}
			Bid bid = new Bid(amount, buyer);
			bidsCatalog.add(bid);
			return true;

		} catch (Exception e) {
			return false;
		}
	}