Answer:
Likely because the producers consume their own goods
Step-by-step explanation:
Often, a traditional economy occurs in third-world countries, where everyone learns skills, and it's passed on through family. However, not only do they sell, but they also use their own goods, because there's nowhere else to buy the goods. This makes them stagnant. This is most common in food, if one family had a special rice recipe, no one else would sell rice, but maybe furniture of metal, but not rice. Because they cannot buy their own rice, they use their own goods.