Question

in the tragedy of the commons scenario, why does each rancher have an incentive to add more and more cattle?
to ruin the environment for future use
to maintain the quality of the pasture
to increase their own short - term profit
to comply with government regulations

Explanation:

In the Tragedy of the Commons, individuals (ranchers here) act in their self - interest. Adding more cattle allows a rancher to get more products (like milk, meat) to sell, which increases their short - term profit. Ruining the environment is not the goal, adding more cattle degrades pasture quality, and government regulations would likely limit cattle numbers, not incentivize adding more.

Answer:

to increase their own short - term profit