Negative externalities and the tragedy of the commons are problems that have a common source. what is this common source? a lack of concern for human rights a lack of competition a lack of clearly defined and enforced property rights self-interest motives of producers and consumers

Answer is "a lack of clearly defined and enforced property rights".

The tragedy of the commons is a term utilized as a part of sociology to portray a circumstance in a mutual asset framework where singular clients acting freely as per their own particular self-intrigue act in opposition to the benefit of all people by exhausting or ruining that asset through their collective activity. If the boundaries are clearly defined this can b avoided. 

send them to therapy or somthing like that

the earthquake in haiti was a magnitude of 7.0 according to the u.s geological survey yet the smaller earthquake in haiti killed more than 200,000 and left more than 1.2 million people homeless. the chile earthquake was a magnitude of 8.8 and 500 times more stronger but chile's earthquake only injured 712 people.