Due to the necessity of living on a fixed income, many retirees find it difficult to
a. afford to keep their large homes
b. maintain their old standard of living
c. pay for unexpected expenses
d. all of the above

Pay for unexpected expenses

thomas jefferson

explanation:

this statement is true.

forests are public goods, available for everybody. when usage of such a good becomes interesting for consumers and its usage increases, there can be a risk of overexploitation. it is a non rival good therefore, if one person consumes the good it does not reduce the availability for subsequent consumers.

these caracteristics require the establishment of measures in order to prevent the destruction of a commonly owned space, for example, to restrict the amount of people that have access to the same time.