What benefit do people get from all the effort which they expend on earth?

When someone's prosperity increases, those who consume it also increase; so what does its owner gain, except that he gets to see it with his eyes?

Here is another enigma that occurs on earth: Sometimes there are righteous people who get what the wicked deserve, and sometimes there are wicked people who get what the righteous deserve. I said, "This also is an enigma."

Send your grain overseas, for after many days you will get a return.