Which of the following technological breakthroughs failed to deliver many economic benefits?

Some types of aid limit or reduce potential benefits as a result of ______ , particularly when aid must be spent on goods or services from the donor country.

Fill in the blank(s) with the appropriate word(s).

Markets are generally more effective at providing ________ and governments are most effective at providing ________

A) pure public goods; common pool resources B) pure private goods; pure public goods C) common pool resources; club goods D) club goods; pure private goods