* @param cs A <code>ChangeSet</code> to update.
     */
    public void csFlushMarket(GoodsType type, ChangeSet cs) {
        Market market = getMarket();
        if (market.hasPriceChanged(type)) {
            // This type of goods has changed price, so we will update
            // the market and send a message as well.
            cs.addMessage(See.only(this),
                          market.makePriceChangeMessage(type));
            market.flushPriceChange(type);
            cs.add(See.only(this), market.getMarketData(type));
        }
    }