Since a cell phone is a private good, if Neha chooses to spend $300 on a cell phone, Neha would get $300 of benefit from the cell phone and Teresa wouldn't receive any benefit from Neha's choice. If Neha still spends $300 on a cell phone and Teresa chooses to contribute $300 to the public park, Neha would still receive the $270 of benefit from Teresa's generosity. In other words, if Neha decides to keep the $300 for a cell phone and Teresa decides to contribute the $300 to the public project, then Neha would receive a total benefit of $300 $270

In other words, if Neha decides to keep the $300 for a cell phone and Teresa decides to contribute the $300 to the public project, then Neha would receive a total benefit of:

$570.

Explanation:

Neha has, in this situation, maximized his benefits to the detriment of the public good.  This is an illustration of the tragedy of the commons.  The tragedy of the common is an economic problem that explains the loss that the society incurs when some persons like Neha neglect to contribute to the common good because they are solely concentrated on pursuing their individual goals for personal gains.

answer about 4-5 percent of the labor force is unemployed;