Final answer:
The fourth constraint on economic growth addresses the unsustainability of increasing resource use per person in a scenario where the human population is stable, positing that it leads to a dead end.
Step-by-step explanation:
The fourth constraint on economic growth is the limitation of increased resource use per person. This constraint posits that even if the human population remains stable, any growth in the amount of resources used per individual would not be compatible with sustainable economic development.
In the context of a no-growth world, where growth in non-physical sectors must also eventually come to a halt, increasing resource use per capita would lead to a dead end, ultimately resulting in failure. This aligns with the broader concept of physically forced economic limits, where continual physical and economic growth is deemed unsustainable due to the limitations imposed by the laws of physics and finite natural resources.