Qinzhou was close to Hezhou, and it happened to be cold weather, so every household was cooking less. These days most common folk used lard, which solidified when it got cold. They heard from the people in Shangyang that sweet potato noodles stewed with bone broth were absolutely delicious.
Though fortune favors the bold and starvation awaits the timid — doing business requires courage — at first everyone was afraid to take too much. They just thought they'd get a few hundred catties and see how it went.
Later, of course, they sold well — gone in just two days.