Presidential popularity and unified public opinion are informal sources of presidential power.

An interrupted time-series design is particularly useful when

A) there are no issues of causality to be addressed. B) the presumed causal event occurs to only some members of a population. C) the presumed causal event occurs to all members of a population. D) the research is concerned with attempting to predict aggressive behavior in children.

The head of a low-income family is given the opportunity to earn extra money for the household by working additional hours full time. However, the boost to household income is reduced by an increase in income tax and health insurance deductibles. This is an example of ______.

A. a poverty trap B. conflicting ideologies C. a welfare trap D. extractive institutions