Because at that time the scale of sweet potato planting is relatively large, not only people want to eat, livestock also want to eat, but also a large part of the sweet potato will be used to process into agricultural by-products to sell money, such as sweet potato flour, sweet potato vermicelli and so on. Nowadays, few people in the village plant sweet potatoes, and even fewer make sweet potato vermicelli every year. And the farmer's family will still make some every year, the year before last made more than 200 pounds of sweet potato vermicelli, last year there were nearly 400 pounds. These basically did not go to the market to sell, all twelve yuan a catty, so that the village people, friends and relatives to buy up.

The production of sweet potato flour is very tedious, its main raw material is sweet potato. First of all, you have to clean the sweet potato one by one, and then crushed with a machine, and then water to rinse filter, but also after many precipitation to get clean sweet potato flour. After that, it has to be boiled on a hot fire, leaked and dried in the sun and other processes. Every year when the family makes sweet potato vermicelli, the whole family has to come to help, and last year the production of nearly 400 nearly sweet potato vermicelli, the family was busy for a week before and after. The cost of the sweet potato flour is five or six dollars a pound, which is actually a bit low.

Here we first calculate the cost of it, we grow here sweet potato flour rate of nearly 20%, generally six or seven pounds of sweet potato to produce 1 pound of sweet potato flour. And one per pound of sweet potato flour is certainly not out of a pound of vermicelli. Even if it is 100%. That in our local price of a pound of sweet potato will be seven or eight cents, and so the cost of sweet potato alone is more than 4 yuan, not counting the loss, machine costs, electricity, labor costs, etc., so all of these are calculated, the cost of sweet potato vermicelli at least in the more than 6 yuan. Then why is the supermarket sweet potato vermicelli so cheap?

In fact, there are two main reasons why they minimize the cost. One is the material, the supermarket sweet potato vermicelli is actually the main material is tapioca added to a small amount of sweet potato flour made, which is why these vermicelli is not resistant to cooking, not slippery, boiled hot and not bright and slippery reasons. Another aspect of the reason, that is the supermarket sweet potato vermicelli are generally mechanized, mass production out, greatly reducing the production cost. Coupled with the fact that the sweet potato vermicelli sold in supermarkets is also unpackaged like the sweet potato vermicelli made by farmers, further reducing the cost. In this way, the cost of sweet potato vermicelli in these supermarkets is only about 2 yuan, so they buy three dollars a pound, in fact, the profit is also higher.