/**
* show a list of all items for which offers exist.
*/
public void fire(Player player, Sentence sentence, EventRaiser npc) {
Market market = TradeCenterZoneConfigurator.getShopFromZone(player.getZone());
RPSlot offersSlot = market.getSlot(Market.OFFERS_SLOT_NAME);
List<Offer> offers = getOffers(offersSlot);
if (offers.isEmpty()) {
npc.say("Sorry, there are currently no offers.");
} else {
String text = buildItemListText(buildItemList(offers));