The reason he said this was simply because Ning Jie had truly run out of stock.
He certainly couldn't just stand there with a goofy grin and say, "Oh, you're too late, there are no more clothes, just wait around," which would be sheer nonsense.
Ning Jie knew that over the past couple of days, the Toad's little followers who had profited from the boom had already packed their bags and left their hometowns; perhaps in eight or ten days, another large wave of merchants would arrive in City B.
Chapter 61