School economies are devoted to:

We have no cars. And we don’t have shops... we have each house – on its own. This leads to a great confusion. In our house, for example, there are two mechanics, but not one carpenter. In another house there are only robbers and no mechanic. If you need, for example, trousers, you go to the carpenter, but the carpenter will not give you the trousers for nothing, because if he starts giving everyone the trousers for nothing...
He will soon be without his pants. Nico laughed.
It is worse! I shrugged the hand of a stranger. “He will not only be without pants, but also without food, because he can’t sew clothes and get food at the same time!
— It is, of course, so, — Nitochka agreed.
“So you have to give the crook for the pants, say, a pear,” continued the Unknown. But if the carpenter does not need a pear, but needs, for example, a table, then you must go to the carpenter, give him a pear for the fact that he will make a table, and then change this table from the carpenter for pants. But the carpenter can also say that he does not need a pear, but a tail. You will have to go to the carpenter. It may also happen that when you come to the carpenter with a tail, he will say that he no longer needs the tail, because he got it elsewhere. Here you will stay with a tail instead of pants! andquot;