The Great Tang Group-Buying Shop: From the Start, I Get a Gunpowder Formula

In Chang'an, Tang Tianjun, owner of the Great Tang Group-Buy Shop, welcomes his first group-buy customers: Old Li and Old Fang.

Old Li: "Shopkeeper, these sweet potatoes taste wonderful. Why is such a rare item only ten coins, and why must at least two people buy it together?"

Old Fang: "I was wondering the same thing, but after tasting one, I'm very pleased. Your Majesty... Old Li, shall we buy one together?"

Taking Old Fang's advice, Old Li and Old Fang each put in five coins to buy a sweet potato together.

Tang Tianjun smiled faintly. "A rare item? Money isn't important. I've had people plant six hundred mu of these things, and each mu yields six or seven thousand catties..."

Ding! Congratulations, Host. Your sweet potatoes have been successfully group-bought. You have obtained the curved-shaft plow manufacturing process!

Ding! Congratulations, Host. Your refined salt has been successfully group-bought. You have obtained a method for purifying rock salt!

This novel and its characters are entirely fictional. Any resemblance is purely coincidental. Do not imitate.