Our general principle is to preserve and grow our assets.
Selling land converts land (physical assets) into land sale proceeds (financial assets).
If we simply spend the proceeds, we are eating into our wealth.
Instead, we preserve and grow the assets by investing land sale proceeds as part of our reserves and earn income on it.
This income is part of NIRC.
We spend 50% of the income and keep the remaining 50% for future generations.
Hence, land sale proceeds are indirectly flowed back through NIRC.
In short, we make our land work for us by generating annual income.