It's complicated. It's hard hard work. image
Here is a simplified explanation. In the future, Lemming #1 is going to burrow deep underground looking for these GBG's. The grasses are needed to keep the herd going.
A second Lemming (number 2) buys the grasses that Lemming #1 has not yet brought up.
The money that Lemm#2 pays for the not yet proven grasses is used to fund burrowing operations.
As I said, it's very complicated. It's hard hard work.It's always worked before.