Trade is the basic way of earning and obtaining additional gear. You can trade weapons, armors, accessories, crafting items and valuables. You can also buy recipes for crafting items. Apart from that, you can buy horses and treatises that increase your power level. The downside of the trade is that there are very few merchants that offer interesting items. Most of the times, you find much more interesting items in the game world. The upside, on the other hand, is that you do not need to search for the merchant that offers you a better price for the items that you sell - everywhere, the price is the same. Also, merchants have no limits on the money that they own and - often - on the number of items to sell.