Why does the author in Du Fu's Qujiang "code" spring clothes? Talk about the occupation of "pawn shop" in ancient times.

I think it should be that he was in financial difficulties at that time, which can also be seen because some of his poems can be expressed. In fact, the most important thing is that he actually relied on the help of his friends in his later years. In fact, ancient pawn shops should actually exchange their own property for some financial subsidies. This should have originated earlier.