Most of the coins being used are bronze, copper, or iron. All of the coins have holes in the middle, and are of varying sizes and shapes - mostly circular, oval, or a sort of rounded square - with many having images of flowers and written inscriptions. There are also long, flat silver coins minted with their weight, and a few similarly minted gold coins used only for the most expensive purchases. The bulk of the coins seem newer and generally unified in design, but there are plenty of older coins, and coins of a different design philosophy, possibly minted elsewhere.
Most of the localized trading is for rice, bolts of cloth (mostly cotton), various tools, pottery, alcohol, perfumes, spices and sugar, a few rarer grains, dried meats, more expensive meats preserved with some kind of magic, books, and a few other assorted goods, mostly as useful for household use, but a handful are luxuries. There's gossip about the newness of it all, the ports opening to the north and the trading stations tentatively established at the border - this is a people long used to limited trade, and to diets barely more varied than plain rice. The vast majority of the goods come from within the country, and there's an undercurrent of excitement about any foreign goods.
The people themselves frequently show signs of past and extended malnourishment, their clothes worn but well cared for, any new pieces eagerly showed off.