There are fewer paper receipts to sign when purchasing products or meals.

购买产品或餐食时，需要签字的纸质收据也更少。

So people started storing their big piles of heavy metal in temples and banks, which gave them paper receipts that they could cash in later.

因此，人们开始将大堆的重金属存放在寺庙和银行中，它们给人们以后可以兑现的纸质收据。